diff --git a/include/code_8098BDC.h b/include/code_8098BDC.h
deleted file mode 100644
index d08b6a0d3..000000000
--- a/include/code_8098BDC.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef GUARD_CODE_8098BDC_H
-#define GUARD_CODE_8098BDC_H
-
-// code_8098DBC.s
-extern void nullsub_104(void);
-
-#endif // GUARD_CODE_8098BDC_H
diff --git a/include/unk_ds_only_feature.h b/include/unk_ds_only_feature.h
new file mode 100644
index 000000000..92353f8f8
--- /dev/null
+++ b/include/unk_ds_only_feature.h
@@ -0,0 +1,19 @@
+#ifndef GUARD_UNK_DS_ONLY_FEATURE_H
+#define GUARD_UNK_DS_ONLY_FEATURE_H
+
+void sub_809C5C4(void);
+void sub_809C618(void);
+void sub_809C63C(void);
+void sub_809C658(void);
+void sub_809C6CC(u16 param_1);
+void sub_809C6EC(void);
+bool8 sub_809C730(void);
+bool8 sub_809C740(void);
+void nullsub_104(void);
+void sub_809C760(void);
+void sub_809C770(s16 mapId_, s16 groundPlaceId_);
+void nullsub_105(void);
+void sub_809CA20(void);
+void nullsub_106(void);
+
+#endif
diff --git a/ld_script.ld b/ld_script.ld
index 366847cf5..5c7257704 100755
--- a/ld_script.ld
+++ b/ld_script.ld
@@ -337,7 +337,7 @@ SECTIONS {
         src/code_8099360.o(.text);
         src/palette_util.o(.text);
         src/code_809A560.o(.text);
-        src/code_809C5C4.o(.text);
+        src/unk_ds_only_feature.o(.text);
         src/script_item.o(.text);
         src/ground_lives_helper.o(.text);
         src/code_809D148.o(.text);
@@ -721,7 +721,7 @@ SECTIONS {
         src/code_8099360.o(.rodata);
         src/palette_util.o(.rodata);
         src/code_809A560.o(.rodata);
-        src/code_809C5C4.o(.rodata);
+        src/unk_ds_only_feature.o(.rodata);
         src/script_item.o(.rodata);
         src/ground_lives_helper.o(.rodata);
         src/code_809D148.o(.rodata);
diff --git a/src/code_80227B8.c b/src/code_80227B8.c
index 2addcc82f..e011730df 100644
--- a/src/code_80227B8.c
+++ b/src/code_80227B8.c
@@ -5,7 +5,6 @@
 #include "code_801AFA4.h"
 #include "code_801B3C0.h"
 #include "code_80227B8.h"
-#include "code_8098BDC.h"
 #include "code_8099360.h"
 #include "common_strings.h"
 #include "input.h"
@@ -15,6 +14,7 @@
 #include "pokemon_3.h"
 #include "string_format.h"
 #include "text_1.h"
+#include "unk_ds_only_feature.h"
 
 EWRAM_INIT static unkStruct_203B294 *sUnknown_203B294 = {NULL};
 
diff --git a/src/friend_area_action_menu.c b/src/friend_area_action_menu.c
index b30b1c90c..994751697 100644
--- a/src/friend_area_action_menu.c
+++ b/src/friend_area_action_menu.c
@@ -6,7 +6,6 @@
 #include "code_801EE10_mid.h"
 #include "friend_list.h"
 #include "code_8024458.h"
-#include "code_8098BDC.h"
 #include "code_8099360.h"
 #include "common_strings.h"
 #include "event_flag.h"
@@ -24,6 +23,7 @@
 #include "string_format.h"
 #include "text_1.h"
 #include "text_2.h"
+#include "unk_ds_only_feature.h"
 
 static EWRAM_INIT struct unkStruct_203B2BC *sUnknown_203B2BC = {NULL};
 
diff --git a/src/friend_list_menu.c b/src/friend_list_menu.c
index f7a3ca671..1d2f0e031 100644
--- a/src/friend_list_menu.c
+++ b/src/friend_list_menu.c
@@ -8,7 +8,6 @@
 #include "code_801EE10_mid.h"
 #include "friend_list.h"
 #include "code_8024458.h"
-#include "code_8098BDC.h"
 #include "code_8099360.h"
 #include "common_strings.h"
 #include "event_flag.h"
@@ -26,6 +25,7 @@
 #include "string_format.h"
 #include "text_1.h"
 #include "text_2.h"
+#include "unk_ds_only_feature.h"
 
 EWRAM_INIT unkStruct_203B2B4 *gUnknown_203B2B4 = {NULL};
 
diff --git a/src/ground_main.c b/src/ground_main.c
index 6304c1615..0861bd24b 100644
--- a/src/ground_main.c
+++ b/src/ground_main.c
@@ -20,6 +20,7 @@
 #include "ground_map_conversion_table.h"
 #include "ground_lives_helper.h"
 #include "script_item.h"
+#include "unk_ds_only_feature.h"
 
 EWRAM_DATA u32 gUnknown_20398A8 = {0};
 EWRAM_DATA s32 gUnknown_20398AC = {0};
@@ -54,7 +55,6 @@ extern void sub_80A73EC();
 
 extern void sub_8098CC8();
 extern void ClearAllItems_8091FB4();
-extern u8 sub_809C730();
 extern void sub_8095494(DungeonMailSeed *param_1, u8 index);
 
 extern u16 gUnknown_2026E4E;
@@ -67,7 +67,6 @@ extern void sub_809A71C(s32);
 extern bool8 sub_809AFAC(void);
 extern bool8 sub_80048BC(void);
 extern u8 sub_80023E4(u32);
-extern bool8 sub_809C740(void);
 extern bool8 sub_8099B94(void);
 extern void FreeGroundMapAction(void);
 extern void FreeGroundLives(void);
@@ -75,7 +74,6 @@ extern void FreeGroundObjects(void);
 extern void FreeGroundEffects(void);
 extern void FreeGroundEvents(void);
 extern void sub_809A610(void);
-extern void sub_809C618(void);
 extern void sub_80A658C(void);
 extern void sub_809D508(void);
 extern void sub_80A7754(void);
@@ -88,7 +86,6 @@ extern void sub_809D0AC(void);
 extern void sub_80A7744(void);
 extern void sub_809D490(void);
 extern void sub_80A62F0(void);
-extern void sub_809C5C4(void);
 extern void sub_809A560(void);
 extern void AllocGroundMapAction(void);
 extern void AllocGroundEvents(void);
@@ -100,13 +97,11 @@ extern void nullsub_124(void);
 extern void GroundLives_Action(void);
 extern void GroundObject_Action(void);
 extern void GroundEffect_Action(void);
-extern void nullsub_105(void);
 extern void sub_809B474(void);
 extern void GroundScript_Unlock();
 extern void sub_809D25C(void);
 extern void sub_80A59DC(void);
 extern void sub_809B614(void);
-extern void sub_809CA20(void);
 extern void sub_80A6E80(void);
 extern void sub_8099BE4(void);
 extern void sub_8099744(void);
@@ -115,17 +110,14 @@ extern void LoadBufferedInputs(void);
 extern void nullsub_120(void);
 extern void sub_80A5E70(void);
 extern void sub_809B638(void);
-extern void nullsub_106(void);
 extern void sub_80A73EC(void);
 extern void sub_8099750(void);
-extern void DoScheduledMemCopies(void);
 extern void GroundMap_Reset(void);
 extern void sub_809D0BC(void);
 extern void DeleteGroundEvents(void);
 extern void DeleteGroundLives(void);
 extern void DeleteGroundObjects(void);
 extern void DeleteGroundEffects(void);
-extern void sub_809C658(void);
 extern void nullsub_16(void);
 extern void UpdateAdventureAchievements(void);
 extern void xxx_call_update_bg_sound_input(void);
@@ -141,7 +133,6 @@ extern void sub_8001D88(void);
 extern u32 GroundMainGameCancelRequest(u32 r0);
 extern void sub_80999D4(s32);
 extern void sub_809D4B0(void);
-extern void sub_809C63C(void);
 extern void sub_8005838(s32, s32);
 
 u32 xxx_script_related_8098468(s32 param_1)
diff --git a/src/ground_script.c b/src/ground_script.c
index 1c810971d..33cf56af2 100644
--- a/src/ground_script.c
+++ b/src/ground_script.c
@@ -14,7 +14,6 @@
 #include "code_80972F4.h"
 #include "code_8097670.h"
 #include "code_80A26CC.h"
-#include "code_8098BDC.h"
 #include "debug.h"
 #include "dungeon_info.h"
 #include "event_flag.h"
@@ -49,6 +48,7 @@
 #include "friend_area_dialogue.h"
 #include "structs/str_dungeon_setup.h"
 #include "ground_map_conversion_table.h"
+#include "unk_ds_only_feature.h"
 
 void GroundMap_Select(s16);
 void GroundMap_SelectDungeon(s32, DungeonLocation*, u32);
@@ -97,7 +97,6 @@ void sub_809AFC8(bool8, s32, s32, const char*);
 u32 sub_809B028(const MenuItem *, s32 a1_, s32 a2, s32 a3, s32 a4_, const char *text);
 bool8 sub_809B1C0(s32, s32, char[12]);
 void sub_809B1D4(u8, s32, s32, const char*);
-void sub_809C770(s16, s16);
 void sub_809D0BC(void);
 void sub_809D124(s32, s32, s32);
 void sub_809D158(s32, PixelPos*);
@@ -172,9 +171,6 @@ void sub_80A8F50(const u8 *buffer, s32, s32 size);
 void sub_80A56A0(s32, s32);
 void sub_80A56F0(s32 *);
 void sub_80A5704(s32 *);
-void sub_809C760(void);
-void sub_809C6EC(void);
-void sub_809C6CC(u16 param_1);
 void sub_80A86C8(s16, s32);
 void sub_80AC1B0(s16, s32);
 void sub_80AD0C8(s16, s32);
diff --git a/src/luminous_cave.c b/src/luminous_cave.c
index 24cf6abfd..737803593 100644
--- a/src/luminous_cave.c
+++ b/src/luminous_cave.c
@@ -7,7 +7,6 @@
 #include "code_801602C.h"
 #include "code_801B3C0.h"
 #include "code_8097670.h"
-#include "code_8098BDC.h"
 #include "code_8099360.h"
 #include "common_strings.h"
 #include "input.h"
@@ -21,6 +20,7 @@
 #include "text_1.h"
 #include "text_util.h"
 #include "pokemon_evolution.h"
+#include "unk_ds_only_feature.h"
 
 enum
 {
diff --git a/src/party_list_menu.c b/src/party_list_menu.c
index 074cd5363..e8688a609 100644
--- a/src/party_list_menu.c
+++ b/src/party_list_menu.c
@@ -8,7 +8,6 @@
 #include "code_801EE10_mid.h"
 #include "code_80227B8.h"
 #include "code_8024458.h"
-#include "code_8098BDC.h"
 #include "code_8099360.h"
 #include "common_strings.h"
 #include "event_flag.h"
@@ -27,6 +26,7 @@
 #include "text_2.h"
 #include "text_3.h"
 #include "text_util.h"
+#include "unk_ds_only_feature.h"
 
 static EWRAM_INIT unkStruct_203B2B8 *sUnknown_203B2B8 = {NULL};
 
diff --git a/src/code_809C5C4.c b/src/unk_ds_only_feature.c
similarity index 98%
rename from src/code_809C5C4.c
rename to src/unk_ds_only_feature.c
index b092846ed..3f400b690 100644
--- a/src/code_809C5C4.c
+++ b/src/unk_ds_only_feature.c
@@ -1,5 +1,6 @@
 #include "global.h"
 #include "globaldata.h"
+#include "unk_ds_only_feature.h"
 #include "memory.h"
 #include "game_options.h"
 #include "event_flag.h"
@@ -9,7 +10,7 @@
 #include "constants/ground_map.h"
 #include "constants/friend_area.h"
 
-// This file effectively does nothing on GBA.
+// This file effectively does nothing on GBA. If I were to guess I'd say it's bottom/top screen related.
 
 struct unkStruct_3001B68
 {
@@ -33,9 +34,6 @@ static IWRAM_INIT struct unkStruct_3001B68 *sUnknown_3001B68 = {NULL};
 
 UNUSED static const u8 sUnused[4] = {0};
 
-bool8 sub_809C740(void);
-void sub_809C63C(void);
-
 static void nullsub_107();
 static void nullsub_108();
 static void nullsub_109();
@@ -84,7 +82,7 @@ void sub_809C63C(void)
 
 void sub_809C658(void)
 {
-    switch(sUnknown_3001B68->unkA) {
+    switch (sUnknown_3001B68->unkA) {
         case 3:
             nullsub_111();
             nullsub_112();
diff --git a/sym_ewram.txt b/sym_ewram.txt
index 8cc8e5b60..e7b453f13 100644
--- a/sym_ewram.txt
+++ b/sym_ewram.txt
@@ -81,7 +81,6 @@
 	.space 4
     .include "src/palette_util.o"
     .include "src/code_809A560.o"
-    .include "src/code_809C5C4.o"
     .include "src/script_item.o"
 	.space 4
     .include "src/code_809D148.o"
diff --git a/sym_iwram_init.txt b/sym_iwram_init.txt
index 1af424969..94ec0d6b8 100644
--- a/sym_iwram_init.txt
+++ b/sym_iwram_init.txt
@@ -4,7 +4,7 @@
 .include "src/code_8023144.o"
 .include "src/friend_list.o"
 .include "src/code_809A560.o"
-.include "src/code_809C5C4.o"
+.include "src/unk_ds_only_feature.o"
 .include "src/ground_map.o"
 .include "src/ground_map_2.o"
 .include "src/ground_sprite.o"