From 6b29ad6affdcdddf2fc1755e2e595d3fdc085cbb Mon Sep 17 00:00:00 2001
From: slaw-22 <>
Date: Tue, 19 May 2026 20:03:27 +0000
Subject: [PATCH] Decomp CopySpawnEntriesOnce. Ensure 100% matches by
 localising DUNGEON_PTR externs with slightly different definitions.

---
 asm/overlay_29_022DEBA4.s          |  2 +-
 asm/overlay_29_022E37DC.s          | 35 +-----------------------------
 include/dungeon.h                  |  7 ++----
 include/spawn_1.h                  |  6 +++++
 include/{spawn.h => spawn_2.h}     |  6 ++---
 main.lsf                           |  3 ++-
 src/dg_camera.c                    |  2 ++
 src/dg_uty.c                       |  1 +
 src/dungeon_ai.c                   |  2 ++
 src/dungeon_ai_attack.c            |  1 +
 src/dungeon_ai_itcm.c              |  2 ++
 src/dungeon_ai_items_1.c           |  1 +
 src/dungeon_ai_movement.c          |  2 ++
 src/dungeon_capabilities_4.c       |  2 ++
 src/dungeon_damage.c               |  2 ++
 src/dungeon_logic_5.c              |  2 ++
 src/dungeon_logic_7.c              |  2 ++
 src/dungeon_map_access.c           |  1 +
 src/dungeon_map_access_1.c         |  2 ++
 src/dungeon_pokemon_attributes_1.c |  2 ++
 src/dungeon_projectile_throw.c     |  2 ++
 src/dungeon_range.c                |  2 ++
 src/dungeon_recruitment.c          |  1 +
 src/fixed_room_data_1.c            |  2 ++
 src/move_checks.c                  |  2 ++
 src/overlay_29_022DEAB0.c          |  2 ++
 src/overlay_29_022F7364.c          |  2 ++
 src/overlay_29_022F73B4.c          |  2 ++
 src/overlay_29_022F7654.c          |  1 +
 src/overlay_29_022FA430.c          |  2 ++
 src/overlay_29_022FB538.c          |  2 ++
 src/overlay_29_022FBBEC.c          |  2 ++
 src/overlay_29_023000E4.c          |  2 ++
 src/overlay_29_0230AB58.c          |  2 ++
 src/overlay_29_02336428.c          |  2 ++
 src/overlay_29_0233836C.c          |  2 ++
 src/overlay_29_023383a8_0.c        |  2 ++
 src/overlay_29_02338548.c          |  2 ++
 src/overlay_29_02338560.c          |  1 +
 src/overlay_29_02338604.c          |  2 ++
 src/overlay_31_02382820.c          |  2 ++
 src/overlay_31_02383478.c          |  1 +
 src/overlay_31_02383880.c          |  1 +
 src/run_dungeon.c                  |  2 ++
 src/run_dungeon_1.c                |  2 ++
 src/spawn_1.c                      | 15 +++++++++++++
 src/{spawn.c => spawn_2.c}         |  4 +++-
 src/weather.c                      |  2 ++
 48 files changed, 104 insertions(+), 45 deletions(-)
 create mode 100644 include/spawn_1.h
 rename include/{spawn.h => spawn_2.h} (75%)
 create mode 100644 src/spawn_1.c
 rename src/{spawn.c => spawn_2.c} (96%)

diff --git a/asm/overlay_29_022DEBA4.s b/asm/overlay_29_022DEBA4.s
index aea6f2cb..2e4405f4 100644
--- a/asm/overlay_29_022DEBA4.s
+++ b/asm/overlay_29_022DEBA4.s
@@ -710,7 +710,7 @@ _022DF574:
 	bl ov29_022E8708
 	bl ov29_022DD5B4
 	bl ov29_023369F8
-	bl ov29_022E7CFC
+	bl CopySpawnEntriesOnce
 	bl ov29_022F7130
 	cmp r5, #0
 	bne _022DF5C4
diff --git a/asm/overlay_29_022E37DC.s b/asm/overlay_29_022E37DC.s
index 7c117624..bed9eaf2 100644
--- a/asm/overlay_29_022E37DC.s
+++ b/asm/overlay_29_022E37DC.s
@@ -5618,37 +5618,4 @@ _022E7CF4: .word DUNGEON_PTR
 _022E7CF8: .word 0x0002C966
 #endif
 	arm_func_end MonsterSpawnListPartialCopy
-
-	arm_func_start ov29_022E7CFC
-ov29_022E7CFC: ; 0x022E7CFC
-#ifdef JAPAN
-#define OV29_022E7CFC_OFFSET -0xA4
-#else
-#define OV29_022E7CFC_OFFSET 0
-#endif
-	stmdb sp!, {r3, lr}
-	ldr r1, _022E7D48 ; =DUNGEON_PTR
-	ldr r0, [r1]
-	add r0, r0, #0x3000
-	ldrb r2, [r0, #0xe28 + OV29_022E7CFC_OFFSET]
-	cmp r2, #0
-	ldmneia sp!, {r3, pc}
-	mov r2, #1
-	strb r2, [r0, #0xe28 + OV29_022E7CFC_OFFSET]
-	ldr r0, [r1]
-	mov r1, #0
-#ifdef JAPAN
-	add r0, r0, #0x124
-#else
-	add r0, r0, #0x174
-#endif
-	add r0, r0, #0x3800
-	bl CopySpawnEntriesMaster
-	ldr r1, _022E7D48 ; =DUNGEON_PTR
-	ldr r1, [r1]
-	add r1, r1, #0x3000
-	str r0, [r1, #0xe20 + OV29_022E7CFC_OFFSET]
-	ldmia sp!, {r3, pc}
-	.align 2, 0
-_022E7D48: .word DUNGEON_PTR
-	arm_func_end ov29_022E7CFC
+ 
diff --git a/include/dungeon.h b/include/dungeon.h
index 003e230d..ca7fe221 100644
--- a/include/dungeon.h
+++ b/include/dungeon.h
@@ -12,8 +12,6 @@
 #define DUNGEON_MAX_SIZE_Y 32
 #define CORRIDOR_ROOM 0xFF
 
-extern struct dungeon *DUNGEON_PTR[];
-
 enum terrain_type
 {
     // These 3 seem to indicate the 'main' type of the terrain. See helper functions for how they're set.
@@ -1217,9 +1215,8 @@ struct dungeon {
     u8 field_0x3e25;
     u8 field_0x3e26;
     u8 field_0x3e27;
-    // 0x3E28: Related in some way to the spawn entries on the floor. Does something about them
-    // if false, then set to true.
-    bool8 unk_spawn_entry_id_check;
+    // 0x3E28: Set to true after spawn entries are copied. Prevents copying spawn entries more than once.
+    bool8 spawn_entries_copied;
     u8 field_0x3e29;
     u8 field_0x3e2a;
     u8 field_0x3e2b;
diff --git a/include/spawn_1.h b/include/spawn_1.h
new file mode 100644
index 00000000..f6b70ad7
--- /dev/null
+++ b/include/spawn_1.h
@@ -0,0 +1,6 @@
+#ifndef PMDSKY_SPAWN_1_H
+#define PMDSKY_SPAWN_1_H
+
+void CopySpawnEntriesOnce();
+
+#endif //PMDSKY_SPAWN_1_H
diff --git a/include/spawn.h b/include/spawn_2.h
similarity index 75%
rename from include/spawn.h
rename to include/spawn_2.h
index bcf3ee28..8868b47e 100644
--- a/include/spawn.h
+++ b/include/spawn_2.h
@@ -1,5 +1,5 @@
-#ifndef PMDSKY_SPAWN_H
-#define PMDSKY_SPAWN_H
+#ifndef PMDSKY_SPAWN_2_H
+#define PMDSKY_SPAWN_2_H
 
 // Weight type index is 0 for normal spawns and 1 for monster house spawns.
 // Returns a monster ID.
@@ -7,4 +7,4 @@ s32 GetMonsterIdToSpawn(s32 weight_type_idx);
 s32 GetMonsterLevelToSpawn(s32 monster_id);
 s32 IsOnMonsterSpawnList(s32 monster_id);
 
-#endif //PMDSKY_SPAWN_H
+#endif //PMDSKY_SPAWN_2_H
diff --git a/main.lsf b/main.lsf
index 6862a146..c8602b4d 100644
--- a/main.lsf
+++ b/main.lsf
@@ -506,7 +506,8 @@ Overlay OVY_29
 	Object asm/overlay_29_022E335C.o
 	Object src/dg_effect.o
 	Object asm/overlay_29_022E37DC.o
-	Object src/spawn.o
+	Object src/spawn_1.o
+	Object src/spawn_2.o
 	Object asm/overlay_29_022E7EC4.o
 	Object src/position_util.o
 	Object asm/overlay_29_rodata_02351628.o
diff --git a/src/dg_camera.c b/src/dg_camera.c
index d6c6ab3e..f5ca9ee8 100644
--- a/src/dg_camera.c
+++ b/src/dg_camera.c
@@ -6,6 +6,8 @@
 
 // file starts at 0x022e26b68
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 EntityIsValid__022E32E8(struct entity *entity)
 {
     if (entity == NULL)
diff --git a/src/dg_uty.c b/src/dg_uty.c
index a0a5aa8a..dd689045 100644
--- a/src/dg_uty.c
+++ b/src/dg_uty.c
@@ -4,6 +4,7 @@
 
 // file starts at 0x022e9020
 
+extern struct dungeon *DUNGEON_PTR[];
 extern struct entity *LEADER_PTR;
 
 struct entity* GetLeader()
diff --git a/src/dungeon_ai.c b/src/dungeon_ai.c
index e2edaa92..ecc8ff16 100644
--- a/src/dungeon_ai.c
+++ b/src/dungeon_ai.c
@@ -24,6 +24,8 @@
 #define WATCHING_CAREFULLY_MESSAGE 0xDEE
 #endif
 
+extern struct dungeon *DUNGEON_PTR[];
+
 extern void EndFrozenClassStatus(struct entity *user, struct entity *target, bool8 log);
 extern void SubstitutePlaceholderStringTags(u8 *string_id, struct entity *entity, u32 param_3);
 extern void LogMessageByIdWithPopupCheckUser(struct entity *user, u32 message_id);
diff --git a/src/dungeon_ai_attack.c b/src/dungeon_ai_attack.c
index 66c67a1b..8763c23a 100644
--- a/src/dungeon_ai_attack.c
+++ b/src/dungeon_ai_attack.c
@@ -27,6 +27,7 @@
 
 bool8 AI_CAN_ATTACK_IN_DIRECTION[NUM_DIRECTIONS] = {0};
 u8 AI_POTENTIAL_ATTACK_TARGET_DIRECTIONS[NUM_DIRECTIONS] = {0};
+extern struct dungeon *DUNGEON_PTR[];
 
 // AI_POTENTIAL_ATTACK_TARGET_WEIGHTS is defined twice within AiConsiderMove, so it needs two separate symbols in ASM until the function is matched.
 #ifdef NONMATCHING
diff --git a/src/dungeon_ai_itcm.c b/src/dungeon_ai_itcm.c
index 98883382..67d4a0cb 100644
--- a/src/dungeon_ai_itcm.c
+++ b/src/dungeon_ai_itcm.c
@@ -29,6 +29,8 @@
 
 #define REGULAR_ATTACK_INDEX 4
 
+extern struct dungeon *DUNGEON_PTR[];
+
 // https://decomp.me/scratch/zg7V6
 #ifdef NONMATCHING
 void ChooseAiMove(struct entity *monster)
diff --git a/src/dungeon_ai_items_1.c b/src/dungeon_ai_items_1.c
index a34190b8..9f156d59 100644
--- a/src/dungeon_ai_items_1.c
+++ b/src/dungeon_ai_items_1.c
@@ -16,6 +16,7 @@
 // This needs to be marked as non-volatile here to match GetPossibleAiThrownItemDirections,
 // but AiDecideUseItem needs it to be volatile to match.
 extern s32 AI_THROWN_ITEM_ACTION_CHOICE_COUNT;
+extern struct dungeon *DUNGEON_PTR[];
 
 void GetPossibleAiThrownItemDirections(struct entity *entity, s32 ally_or_enemy, struct item *item, bool8 always_add)
 {
diff --git a/src/dungeon_ai_movement.c b/src/dungeon_ai_movement.c
index c7a4d5da..cdbdf7bd 100644
--- a/src/dungeon_ai_movement.c
+++ b/src/dungeon_ai_movement.c
@@ -40,6 +40,8 @@
 #define TURN_RIGHT_90 4
 #define TURN_LEFT_135 5
 
+extern struct dungeon *DUNGEON_PTR[];
+
 struct can_move_in_direction_info
 {
     bool8 try_turn;
diff --git a/src/dungeon_capabilities_4.c b/src/dungeon_capabilities_4.c
index 1ad90b87..7ec740c0 100644
--- a/src/dungeon_capabilities_4.c
+++ b/src/dungeon_capabilities_4.c
@@ -16,6 +16,8 @@
 #include "secondary_terrain_types.h"
 #include "targeting.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 CanMonsterMoveOrSwapWithAllyInAnyDirection(struct entity *monster)
 {
     for (u8 i = 0; i < NUM_DIRECTIONS; i++)
diff --git a/src/dungeon_damage.c b/src/dungeon_damage.c
index 0bbdb705..90669778 100644
--- a/src/dungeon_damage.c
+++ b/src/dungeon_damage.c
@@ -12,6 +12,8 @@
 
 #define NUM_EFFECTIVENESS 4
 
+extern struct dungeon *DUNGEON_PTR[];
+
 s32 WeightWeakTypePicker(struct entity *user, struct entity *target, enum type_id move_type)
 {
     s32 weight = 1;
diff --git a/src/dungeon_logic_5.c b/src/dungeon_logic_5.c
index 5c42e62a..7a36e2c9 100644
--- a/src/dungeon_logic_5.c
+++ b/src/dungeon_logic_5.c
@@ -9,6 +9,8 @@
 #include "overlay_29_023000E4.h"
 #include "special_move_types.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 extern s32 GetMoveBasePower(struct move*);
 
 bool8 CanSeeTeammate(struct entity *monster)
diff --git a/src/dungeon_logic_7.c b/src/dungeon_logic_7.c
index 036f3cf4..a08b0767 100644
--- a/src/dungeon_logic_7.c
+++ b/src/dungeon_logic_7.c
@@ -6,6 +6,8 @@
 #include "fixed_room_data_1.h"
 #include "util.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 IsMonsterLoneOutlaw(struct monster* monster_info)
 {
     return IsBehaviorLoneOutlaw(monster_info->monster_behavior);
diff --git a/src/dungeon_map_access.c b/src/dungeon_map_access.c
index 9b851f69..de5b89e2 100644
--- a/src/dungeon_map_access.c
+++ b/src/dungeon_map_access.c
@@ -1,6 +1,7 @@
 #include "dungeon_map_access.h"
 #include "dungeon.h"
 
+extern struct dungeon *DUNGEON_PTR[];
 extern struct tile DEFAULT_TILE_COPY;
 extern struct tile* DEFAULT_TILE;
 
diff --git a/src/dungeon_map_access_1.c b/src/dungeon_map_access_1.c
index a596cdc3..dfbb7969 100644
--- a/src/dungeon_map_access_1.c
+++ b/src/dungeon_map_access_1.c
@@ -4,6 +4,8 @@
 #include "secondary_terrain_types.h"
 #include "tileset.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 IsTileGround(struct tile *tile)
 {
     bool8 is_ground = FALSE;
diff --git a/src/dungeon_pokemon_attributes_1.c b/src/dungeon_pokemon_attributes_1.c
index 5942a625..eea90f87 100644
--- a/src/dungeon_pokemon_attributes_1.c
+++ b/src/dungeon_pokemon_attributes_1.c
@@ -11,6 +11,8 @@
 #include "progression.h"
 #include "pokemon.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 CanSeeInvisibleMonsters(struct entity *entity)
 {
     if (GetEntInfo(entity)->blinker_class_status.blinded == STATUS_BLINKER_EYEDROPS)
diff --git a/src/dungeon_projectile_throw.c b/src/dungeon_projectile_throw.c
index 2cfb254a..fd0fe6c9 100644
--- a/src/dungeon_projectile_throw.c
+++ b/src/dungeon_projectile_throw.c
@@ -20,6 +20,8 @@
 #define CURVED_PROJECTILE_LOG_MESSAGE_3 0xbe3
 #endif
 
+extern struct dungeon *DUNGEON_PTR[];
+
 extern bool8 ov29_022E2CA0(struct position *pos);
 extern void ov29_0234B4CC(bool8 val);
 extern s32 SinAbs4096(s32 x);
diff --git a/src/dungeon_range.c b/src/dungeon_range.c
index de6aa98d..fefbcd05 100644
--- a/src/dungeon_range.c
+++ b/src/dungeon_range.c
@@ -5,6 +5,8 @@
 #include "dungeon_range_2.h"
 #include "main_0208655C.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 IsPositionActuallyInSight(struct position *origin, struct position *target, bool8 user_has_dropeye)
 {
     s16 visibility = GetVisibilityRange();
diff --git a/src/dungeon_recruitment.c b/src/dungeon_recruitment.c
index 38f081d4..2694ef0e 100644
--- a/src/dungeon_recruitment.c
+++ b/src/dungeon_recruitment.c
@@ -33,6 +33,7 @@ extern const s16 ROCK_HORN_RECRUIT_BOOST;
 extern const s16 GRASS_CORNET_RECRUIT_BOOST;
 extern const s16 SKY_MELODICA_RECRUIT_BOOST;
 
+extern struct dungeon *DUNGEON_PTR[];
 extern s16 RECRUITMENT_LEVEL_BOOST_TABLE[];
 
 bool8 SpecificRecruitCheck(u32 monster_id)
diff --git a/src/fixed_room_data_1.c b/src/fixed_room_data_1.c
index 719929e9..73419034 100644
--- a/src/fixed_room_data_1.c
+++ b/src/fixed_room_data_1.c
@@ -2,6 +2,8 @@
 
 #include "dungeon.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 IsFullFloorFixedRoom()
 {
     u8 fixed_room_id = DUNGEON_PTR[0]->gen_info.fixed_room_id;
diff --git a/src/move_checks.c b/src/move_checks.c
index b8d15c28..3e430f1e 100644
--- a/src/move_checks.c
+++ b/src/move_checks.c
@@ -17,6 +17,8 @@
 #include "trap.h"
 #include "weather.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 extern bool8 GendersEqualNotGenderless(s16 monster1, s16 monster2);
 
 // https://decomp.me/scratch/TnODN
diff --git a/src/overlay_29_022DEAB0.c b/src/overlay_29_022DEAB0.c
index 089bdb63..2e9472e5 100644
--- a/src/overlay_29_022DEAB0.c
+++ b/src/overlay_29_022DEAB0.c
@@ -11,6 +11,8 @@ void sub_020091B0(s32, s32);
 void StartFadeDungeonWrapper(s32, s32, s32);
 void ov29_0234C738(s32);
 
+extern struct dungeon *DUNGEON_PTR[];
+
 struct dungeon* DungeonAlloc(void)
 {
     #ifdef JAPAN
diff --git a/src/overlay_29_022F7364.c b/src/overlay_29_022F7364.c
index af4d7bf5..0b6d78be 100644
--- a/src/overlay_29_022F7364.c
+++ b/src/overlay_29_022F7364.c
@@ -4,6 +4,8 @@
 #include "util.h"
 #include "main_02051760.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 EntityIsValid__022F7364(struct entity *entity)
 {
     if (entity == NULL)
diff --git a/src/overlay_29_022F73B4.c b/src/overlay_29_022F73B4.c
index 7f62619d..d2e69af2 100644
--- a/src/overlay_29_022F73B4.c
+++ b/src/overlay_29_022F73B4.c
@@ -3,6 +3,8 @@
 #include "util.h"
 #include "enums.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool32 FloorNumberIsEven() {
     struct dungeon *dungeon = DUNGEON_PTR[0];
     if (dungeon->id == DUNGEON_LABYRINTH_CAVE && dungeon->floor == 10) return 0;
diff --git a/src/overlay_29_022F7654.c b/src/overlay_29_022F7654.c
index 5938a57a..3fd337f6 100644
--- a/src/overlay_29_022F7654.c
+++ b/src/overlay_29_022F7654.c
@@ -3,6 +3,7 @@
 #include "enums.h"
 #include "wan.h"
 
+extern struct dungeon *DUNGEON_PTR[];
 extern struct wan_table *WAN_TABLE;
 extern s16 GetSpriteIndex__020526EC(s16 monster_id);
 extern s16 ReplaceWanFromBinFile(struct wan_table *wan_table, s16 wan_id, s16 pack_id, s16 file_index, bool8 compressed);
diff --git a/src/overlay_29_022FA430.c b/src/overlay_29_022FA430.c
index 210a9516..c1317943 100644
--- a/src/overlay_29_022FA430.c
+++ b/src/overlay_29_022FA430.c
@@ -7,6 +7,8 @@
 #include "overlay_29_02336428.h"
 #include "position_util.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 ShouldMonsterHeadToStairs(struct entity *entity)
 {
     u8 stairs_room = GetStairsRoom();
diff --git a/src/overlay_29_022FB538.c b/src/overlay_29_022FB538.c
index 5d10936a..4c8aec6d 100644
--- a/src/overlay_29_022FB538.c
+++ b/src/overlay_29_022FB538.c
@@ -5,6 +5,8 @@
 #include "overlay_29_022F7364.h"
 #include "targeting.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 extern u8 GetScenarioBalanceVeneer(); 
 extern u32 GetSpawnThreshold();
 
diff --git a/src/overlay_29_022FBBEC.c b/src/overlay_29_022FBBEC.c
index c904f793..bbc00357 100644
--- a/src/overlay_29_022FBBEC.c
+++ b/src/overlay_29_022FBBEC.c
@@ -3,6 +3,8 @@
 #include "dungeon_util_static.h"
 #include "overlay_29_022F7364.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 struct entity* FindMonsterWithBehavior(enum monster_behavior monster_behavior)
 {
     for (s32 i = 0; i < DUNGEON_MAX_POKEMON; i++)
diff --git a/src/overlay_29_023000E4.c b/src/overlay_29_023000E4.c
index b163d6ec..8e91ddf2 100644
--- a/src/overlay_29_023000E4.c
+++ b/src/overlay_29_023000E4.c
@@ -1,6 +1,8 @@
 #include "overlay_29_023000E4.h"
 #include "dungeon_util_static.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 EntityIsValid__023000E4(struct entity *entity)
 {
     if (entity == NULL)
diff --git a/src/overlay_29_0230AB58.c b/src/overlay_29_0230AB58.c
index ae04ebfc..b6237b38 100644
--- a/src/overlay_29_0230AB58.c
+++ b/src/overlay_29_0230AB58.c
@@ -3,6 +3,8 @@
 #include "dungeon_pokemon_attributes.h"
 #include "dungeon_util_static.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 ScrappyShouldActivate(struct entity *attacker, struct entity *defender, enum type_id attack_type)
 {
     for (s16 i = 0; i < 2; i++)
diff --git a/src/overlay_29_02336428.c b/src/overlay_29_02336428.c
index 71401239..5361d0d3 100644
--- a/src/overlay_29_02336428.c
+++ b/src/overlay_29_02336428.c
@@ -2,6 +2,8 @@
 #include "dungeon.h"
 #include "dungeon_map_access.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 u8 GetStairsRoom()
 {
     return GetTile(DUNGEON_PTR[0]->gen_info.stairs_pos.x, DUNGEON_PTR[0]->gen_info.stairs_pos.y)->room;
diff --git a/src/overlay_29_0233836C.c b/src/overlay_29_0233836C.c
index 3c99d670..ace89675 100644
--- a/src/overlay_29_0233836C.c
+++ b/src/overlay_29_0233836C.c
@@ -3,6 +3,8 @@
 #include "main_0200330C.h"
 #include "overlay_29_02337CA8.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 extern void LogMessageByIdWithPopupCheckUser(struct entity *user, u32 message_id);
 extern void ov29_02306D54(struct entity *);
 
diff --git a/src/overlay_29_023383a8_0.c b/src/overlay_29_023383a8_0.c
index 88fce053..551a48f3 100644
--- a/src/overlay_29_023383a8_0.c
+++ b/src/overlay_29_023383a8_0.c
@@ -3,6 +3,8 @@
 #include "dungeon.h"
 #include "dungeon_mode.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 extern void TryRevealAttackedTrap(struct position* pos, int param1);
 extern bool32 PositionIsOnHiddenStairs(struct position* pos);
 extern void HiddenStairsTrigger(bool32 param0);
diff --git a/src/overlay_29_02338548.c b/src/overlay_29_02338548.c
index 2a9efa14..bd0cb075 100644
--- a/src/overlay_29_02338548.c
+++ b/src/overlay_29_02338548.c
@@ -2,6 +2,8 @@
 
 #include "dungeon.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 TeamMemberHasExclusiveItemEffectActive(u8);
 
 bool8 ShouldBoostKecleonShopSpawnChance(void)
diff --git a/src/overlay_29_02338560.c b/src/overlay_29_02338560.c
index a5f5bdde..fb5a3ce3 100644
--- a/src/overlay_29_02338560.c
+++ b/src/overlay_29_02338560.c
@@ -2,6 +2,7 @@
 #include "dungeon.h"
 #include "fixed_room_data_1.h"
 
+extern struct dungeon *DUNGEON_PTR[];
 extern u16 ov29_02352B5C[2];
 
 void ov29_02344E88(s16 *param_1);
diff --git a/src/overlay_29_02338604.c b/src/overlay_29_02338604.c
index 7039b96c..c411d597 100644
--- a/src/overlay_29_02338604.c
+++ b/src/overlay_29_02338604.c
@@ -2,6 +2,8 @@
 
 #include "dungeon.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 IsSecretBazaar()
 {
     return DUNGEON_PTR[0]->gen_info.fixed_room_id==FIXED_SECRET_BAZAAR;
diff --git a/src/overlay_31_02382820.c b/src/overlay_31_02382820.c
index 02cb6da3..f5d84bb2 100644
--- a/src/overlay_31_02382820.c
+++ b/src/overlay_31_02382820.c
@@ -6,6 +6,8 @@
 #include "weather.h"
 #include "main_02001188.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 extern const u8 DUNGEON_MENU_SWITCH_STR1[];// = "[dungeon:0]";
 
 extern struct struct_1* OVERLAY31_UNKNOWN_POINTER__NA_238A260[2];
diff --git a/src/overlay_31_02383478.c b/src/overlay_31_02383478.c
index d1b7e5c7..0e7b7616 100644
--- a/src/overlay_31_02383478.c
+++ b/src/overlay_31_02383478.c
@@ -3,6 +3,7 @@
 #include "dungeon_map_access.h"
 #include "overlay_29_022E1610.h"
 
+extern struct dungeon *DUNGEON_PTR[];
 extern struct loc_struct* OVERLAY31_UNKNOWN_POINTER__NA_238A26C;
 extern struct bag_items* BAG_ITEMS_PTR_MIRROR;
 extern u32 OVERLAY31_UNKNOWN_STRUCT__NA_2389EF0;
diff --git a/src/overlay_31_02383880.c b/src/overlay_31_02383880.c
index caacf7a0..562e6640 100644
--- a/src/overlay_31_02383880.c
+++ b/src/overlay_31_02383880.c
@@ -4,6 +4,7 @@
 #include "overlay_31_02383478.h"
 #include "main_02001188.h"
 
+extern struct dungeon *DUNGEON_PTR[];
 extern struct loc_struct* OVERLAY31_UNKNOWN_POINTER__NA_238A26C;
 
 extern u8 PositionHasItem(struct position* pos);
diff --git a/src/run_dungeon.c b/src/run_dungeon.c
index a794ce10..068ddbd2 100644
--- a/src/run_dungeon.c
+++ b/src/run_dungeon.c
@@ -2,6 +2,8 @@
 #include "dungeon.h"
 #include "overlay_10_022C2574.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 IsCurrentTilesetBackground()
 {
     return IsBackgroundTileset(DUNGEON_PTR[0]->gen_info.tileset_id);
diff --git a/src/run_dungeon_1.c b/src/run_dungeon_1.c
index 2514eb0d..213b6d70 100644
--- a/src/run_dungeon_1.c
+++ b/src/run_dungeon_1.c
@@ -2,6 +2,8 @@
 #include "dungeon.h"
 #include "enums.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 bool8 IsBossFight(enum fixed_room_id fixed_room_id)
 {
     if (fixed_room_id != FIXED_NONE && fixed_room_id < FIXED_ZERO_ISLE_NORTH)
diff --git a/src/spawn_1.c b/src/spawn_1.c
new file mode 100644
index 00000000..5184eb96
--- /dev/null
+++ b/src/spawn_1.c
@@ -0,0 +1,15 @@
+#include "dungeon.h" 
+#include "spawn_1.h"
+
+extern s32 CopySpawnEntriesMaster(struct monster_spawn_entry[], s32);
+extern struct dungeon *DUNGEON_PTR;
+
+void CopySpawnEntriesOnce() {
+    if (DUNGEON_PTR->spawn_entries_copied != FALSE) {
+        return;
+    }
+
+    DUNGEON_PTR->spawn_entries_copied = 1;
+    DUNGEON_PTR->monster_spawn_entries_length =
+        CopySpawnEntriesMaster(DUNGEON_PTR->spawn_entries, 0);
+}
diff --git a/src/spawn.c b/src/spawn_2.c
similarity index 96%
rename from src/spawn.c
rename to src/spawn_2.c
index fa293a17..ee31445f 100644
--- a/src/spawn.c
+++ b/src/spawn_2.c
@@ -1,7 +1,9 @@
 #include "dg_random.h"
 #include "dungeon.h"
 #include "overlay_29_022F73B4.h"
-#include "spawn.h"
+#include "spawn_2.h"
+
+extern struct dungeon *DUNGEON_PTR[];
 
 extern s32 GetMonsterIdFromSpawnEntry(struct monster_spawn_entry *);
 extern s32 GetMonsterLevelFromSpawnEntry(struct monster_spawn_entry *);
diff --git a/src/weather.c b/src/weather.c
index 481748ae..83de076c 100644
--- a/src/weather.c
+++ b/src/weather.c
@@ -3,6 +3,8 @@
 #include "dungeon_items.h"
 #include "dungeon_pokemon_attributes.h"
 
+extern struct dungeon *DUNGEON_PTR[];
+
 enum weather_id GetApparentWeather(struct entity *entity)
 {
     if (entity != NULL)