diff --git a/asm/unk_0203170C.s b/asm/unk_0203170C.s
deleted file mode 100644
index ba53bcd9c..000000000
--- a/asm/unk_0203170C.s
+++ /dev/null
@@ -1,251 +0,0 @@
-	.include "asm/macros.inc"
-	.include "global.inc"
-
-	.text
-
-	thumb_func_start sub_0203170C
-sub_0203170C: ; 0x0203170C
-	mov r0, #0x40
-	bx lr
-	thumb_func_end sub_0203170C
-
-	thumb_func_start sub_02031710
-sub_02031710: ; 0x02031710
-	push {r4, lr}
-	add r4, r0, #0
-	mov r1, #0
-	mov r2, #0x40
-	bl MI_CpuFill8
-	add r0, r4, #0
-	mov r1, #0
-	mov r2, #0x33
-	bl memset
-	mov r0, #1
-	str r0, [r4, #0x34]
-	mov r0, #0x1f
-	bl SaveSubstruct_UpdateCRC
-	pop {r4, pc}
-	.balign 4, 0
-	thumb_func_end sub_02031710
-
-	thumb_func_start sub_02031734
-sub_02031734: ; 0x02031734
-	push {r3, lr}
-	mov r1, #0x1f
-	bl SavArray_get
-	bl sub_02031710
-	pop {r3, pc}
-	.balign 4, 0
-	thumb_func_end sub_02031734
-
-	thumb_func_start sub_02031744
-sub_02031744: ; 0x02031744
-	push {r3, lr}
-	mov r1, #0x1f
-	bl SavArray_get
-	mov r1, #0
-	ldrsb r0, [r0, r1]
-	cmp r0, #0
-	beq _02031756
-	mov r1, #1
-_02031756:
-	add r0, r1, #0
-	pop {r3, pc}
-	.balign 4, 0
-	thumb_func_end sub_02031744
-
-	thumb_func_start sub_0203175C
-sub_0203175C: ; 0x0203175C
-	push {r4, lr}
-	add r4, r1, #0
-	mov r1, #0x1f
-	bl SavArray_get
-	add r1, r4, #0
-	bl strcpy
-	mov r0, #0x1f
-	bl SaveSubstruct_UpdateCRC
-	pop {r4, pc}
-	thumb_func_end sub_0203175C
-
-	thumb_func_start sub_02031774
-sub_02031774: ; 0x02031774
-	ldr r3, _0203177C ; =SavArray_get
-	mov r1, #0x1f
-	bx r3
-	nop
-_0203177C: .word SavArray_get
-	thumb_func_end sub_02031774
-
-	thumb_func_start sub_02031780
-sub_02031780: ; 0x02031780
-	push {r3, r4, r5, lr}
-	add r5, r1, #0
-	mov r1, #0x1f
-	add r4, r2, #0
-	bl SavArray_get
-	cmp r5, #3
-	bhi _020317B2
-	add r1, r5, r5
-	add r1, pc
-	ldrh r1, [r1, #6]
-	lsl r1, r1, #0x10
-	asr r1, r1, #0x10
-	add pc, r1
-_0203179C: ; jump table
-	.short _020317A4 - _0203179C - 2 ; case 0
-	.short _020317A8 - _0203179C - 2 ; case 1
-	.short _020317AC - _0203179C - 2 ; case 2
-	.short _020317B0 - _0203179C - 2 ; case 3
-_020317A4:
-	str r4, [r0, #0x34]
-	b _020317B2
-_020317A8:
-	strh r4, [r0, #0x38]
-	b _020317B2
-_020317AC:
-	strh r4, [r0, #0x3a]
-	b _020317B2
-_020317B0:
-	str r4, [r0, #0x3c]
-_020317B2:
-	mov r0, #0x1f
-	bl SaveSubstruct_UpdateCRC
-	pop {r3, r4, r5, pc}
-	.balign 4, 0
-	thumb_func_end sub_02031780
-
-	thumb_func_start sub_020317BC
-sub_020317BC: ; 0x020317BC
-	push {r4, lr}
-	add r4, r1, #0
-	mov r1, #0x1f
-	bl SavArray_get
-	cmp r4, #3
-	bhi _020317EE
-	add r1, r4, r4
-	add r1, pc
-	ldrh r1, [r1, #6]
-	lsl r1, r1, #0x10
-	asr r1, r1, #0x10
-	add pc, r1
-_020317D6: ; jump table
-	.short _020317DE - _020317D6 - 2 ; case 0
-	.short _020317E2 - _020317D6 - 2 ; case 1
-	.short _020317E6 - _020317D6 - 2 ; case 2
-	.short _020317EA - _020317D6 - 2 ; case 3
-_020317DE:
-	ldr r0, [r0, #0x34]
-	pop {r4, pc}
-_020317E2:
-	ldrh r0, [r0, #0x38]
-	pop {r4, pc}
-_020317E6:
-	ldrh r0, [r0, #0x3a]
-	pop {r4, pc}
-_020317EA:
-	ldr r0, [r0, #0x3c]
-	pop {r4, pc}
-_020317EE:
-	mov r0, #0
-	pop {r4, pc}
-	.balign 4, 0
-	thumb_func_end sub_020317BC
-
-	thumb_func_start sub_020317F4
-sub_020317F4: ; 0x020317F4
-	push {r3, r4, r5, r6, r7, lr}
-	add r5, r0, #0
-	add r4, r1, #0
-	bl sub_0202CA44
-	add r6, r0, #0
-	add r0, r5, #0
-	bl Sav2_PlayerData_GetProfileAddr
-	add r7, r0, #0
-	add r0, r5, #0
-	bl sub_02031774
-	str r0, [sp]
-	add r0, r4, #0
-	mov r1, #0
-	mov r2, #0x64
-	bl MI_CpuFill8
-	mov r0, #GAME_VERSION
-	strb r0, [r4]
-	mov r0, #2
-	strb r0, [r4, #1]
-	add r0, r6, #0
-	bl sub_0202CA8C
-	strb r0, [r4, #2]
-	add r0, r6, #0
-	bl sub_0202CA90
-	strb r0, [r4, #3]
-	add r0, r7, #0
-	bl PlayerProfile_GetTrainerID
-	str r0, [r4, #4]
-	add r0, r7, #0
-	bl PlayerProfile_GetNamePtr
-	add r1, r0, #0
-	add r0, r4, #0
-	add r0, #8
-	bl CopyU16StringArray
-	mov r0, #0
-	str r0, [r4, #0x18]
-	add r0, r4, #0
-	ldr r1, [sp]
-	add r0, #0x24
-	bl strcpy
-	add r0, r5, #0
-	mov r1, #0
-	bl sub_020317BC
-	str r0, [r4, #0x5c]
-	mov r0, #0x1f
-	bl SaveSubstruct_UpdateCRC
-	pop {r3, r4, r5, r6, r7, pc}
-	.balign 4, 0
-	thumb_func_end sub_020317F4
-
-	thumb_func_start sub_0203186C
-sub_0203186C: ; 0x0203186C
-	push {r3, r4, r5, lr}
-	add r5, r1, #0
-	bl sub_020317F4
-	bl LCRandom
-	mov r1, #0xfa
-	lsl r1, r1, #2
-	bl _s32_div_f
-	add r0, r5, #0
-	add r4, r1, #0
-	add r0, #0x60
-	strh r4, [r0]
-	ldr r0, _02031898 ; =0x0000FFFF
-	add r5, #0x62
-	strh r0, [r5]
-	mov r0, #0x1f
-	bl SaveSubstruct_UpdateCRC
-	add r0, r4, #0
-	pop {r3, r4, r5, pc}
-	.balign 4, 0
-_02031898: .word 0x0000FFFF
-	thumb_func_end sub_0203186C
-
-	thumb_func_start sub_0203189C
-sub_0203189C: ; 0x0203189C
-	push {r4, r5, r6, lr}
-	add r5, r1, #0
-	add r6, r0, #0
-	mov r1, #0x1f
-	bl SavArray_get
-	add r4, r0, #0
-	add r0, r6, #0
-	add r1, r5, #0
-	bl sub_020317F4
-	add r0, r5, #0
-	ldrh r1, [r4, #0x38]
-	add r0, #0x60
-	add r5, #0x62
-	strh r1, [r0]
-	ldrh r0, [r4, #0x3a]
-	strh r0, [r5]
-	mov r0, #0x1f
-	bl SaveSubstruct_UpdateCRC
-	pop {r4, r5, r6, pc}
-	thumb_func_end sub_0203189C
diff --git a/include/unk_0202CA24.h b/include/unk_0202CA24.h
new file mode 100644
index 000000000..13ffd5e0f
--- /dev/null
+++ b/include/unk_0202CA24.h
@@ -0,0 +1,8 @@
+#ifndef POKEHEARTGOLD_UNK_0202CA24_H
+#define POKEHEARTGOLD_UNK_0202CA24_H
+
+void *sub_0202CA44(SAVEDATA *);
+u8 sub_0202CA8C(void *);
+u8 sub_0202CA90(void *);
+
+#endif //POKEHEARTGOLD_UNK_0202CA24_H
diff --git a/include/unk_0203170C.h b/include/unk_0203170C.h
new file mode 100644
index 000000000..9861a6bf7
--- /dev/null
+++ b/include/unk_0203170C.h
@@ -0,0 +1,40 @@
+#ifndef POKEHEARTGOLD_UNK_0203170C_H
+#define POKEHEARTGOLD_UNK_0203170C_H
+
+typedef struct {
+    char unk0[0x33];
+    u8 unk33;
+    u32 unk34;
+    u16 unk38;
+    u16 unk3a;
+    u32 unk3c;
+} Unk0203170C;
+
+typedef struct {
+    u8 version;
+    u8 language;
+    u8 unk2;
+    u8 unk3;
+    u32 otId;
+    u16 name[OT_NAME_LENGTH + 1];
+    u32 unk18;
+    u8 unk1c[0x8];
+    char unk24[0x33];
+    u8 unk57[0x5];
+    u32 unk5c;
+    u16 unk60;
+    u16 unk62;
+} Unk020317F4;
+
+u32 sub_0203170C(void);
+void sub_02031710(Unk0203170C *a0);
+void sub_02031734(SAVEDATA *saveData);
+BOOL sub_02031744(SAVEDATA *saveData);
+void sub_0203175C(SAVEDATA *saveData, char *a1);
+Unk0203170C *sub_02031774(SAVEDATA *saveData);
+void sub_02031780(SAVEDATA *saveData, u32 a1, u32 a2);
+u32 sub_020317BC(SAVEDATA *saveData, u32 a1);
+s32 sub_0203186C(SAVEDATA *saveData, Unk020317F4 *a1);
+void sub_0203189C(SAVEDATA *saveData, Unk020317F4 *a1);
+
+#endif //POKEHEARTGOLD_UNK_0203170C_H
diff --git a/main.lsf b/main.lsf
index fdef348f4..12047dad5 100644
--- a/main.lsf
+++ b/main.lsf
@@ -126,7 +126,7 @@ Static main
 	Object src/photo_album.o
 	Object asm/unk_0202FBCC.o
 	Object asm/unk_02030A98.o
-	Object asm/unk_0203170C.o
+	Object src/unk_0203170C.o
 	Object asm/unk_020318C8.o
 	Object asm/unk_02031904.o
 	Object asm/unk_02031AF0.o
diff --git a/src/unk_0203170C.c b/src/unk_0203170C.c
new file mode 100644
index 000000000..887ded141
--- /dev/null
+++ b/src/unk_0203170C.c
@@ -0,0 +1,118 @@
+#include "player_data.h"
+#include "save.h"
+#include "unk_0202CA24.h"
+#include "unk_0203170C.h"
+
+u32 sub_0203170C(void) {
+    return sizeof(Unk0203170C);
+}
+
+void sub_02031710(Unk0203170C *a0) {
+    MI_CpuFill8(a0, 0, sizeof(Unk0203170C));
+    memset(a0, 0, sizeof(a0->unk0));
+    a0->unk34 = 1;
+    SaveSubstruct_UpdateCRC(SAVE_UNK_31);
+}
+
+void sub_02031734(SAVEDATA *saveData) {
+    sub_02031710(SavArray_get(saveData, SAVE_UNK_31));
+}
+
+BOOL sub_02031744(SAVEDATA *saveData) {
+    Unk0203170C *ptr = (Unk0203170C *)(SavArray_get(saveData, SAVE_UNK_31));
+    if ((s8)(ptr->unk0[0]) != 0) {
+        return TRUE;
+    }
+    return FALSE;
+}
+
+void sub_0203175C(SAVEDATA *saveData, char *a1) {
+    Unk0203170C *ptr = (Unk0203170C *)(SavArray_get(saveData, SAVE_UNK_31));
+    strcpy(ptr->unk0, a1);
+    SaveSubstruct_UpdateCRC(SAVE_UNK_31);
+}
+
+Unk0203170C *sub_02031774(SAVEDATA *saveData) {
+    return SavArray_get(saveData, SAVE_UNK_31);
+}
+
+void sub_02031780(SAVEDATA *saveData, u32 a1, u32 a2) {
+    Unk0203170C *ptr = (Unk0203170C *)(SavArray_get(saveData, SAVE_UNK_31));
+    switch (a1) {
+    case 0:
+        ptr->unk34 = a2;
+        break;
+    case 1:
+        ptr->unk38 = a2;
+        break;
+    case 2:
+        ptr->unk3a = a2;
+        break;
+    case 3:
+        ptr->unk3c = a2;
+        break;
+    }
+    SaveSubstruct_UpdateCRC(SAVE_UNK_31);
+}
+
+u32 sub_020317BC(SAVEDATA *saveData, u32 a1) {
+    Unk0203170C *ptr = (Unk0203170C *)(SavArray_get(saveData, SAVE_UNK_31));
+    switch (a1) {
+    case 0:
+        return ptr->unk34;
+    case 1:
+        return ptr->unk38;
+    case 2:
+        return ptr->unk3a;
+    case 3:
+        return ptr->unk3c;
+    }
+    return 0;
+}
+
+static void sub_020317F4(SAVEDATA *saveData, Unk020317F4 *a1) {
+    void *ptr;
+    Unk0203170C *ptr2;
+    PLAYERPROFILE* profile;
+
+    ptr = sub_0202CA44(saveData);
+    profile = Sav2_PlayerData_GetProfileAddr(saveData);
+    ptr2 = sub_02031774(saveData);
+
+    MI_CpuFill8(a1, 0, sizeof(Unk020317F4));
+    a1->version = GAME_VERSION;
+    a1->language = GAME_LANGUAGE;
+    a1->unk2 = sub_0202CA8C(ptr);
+    a1->unk3 = sub_0202CA90(ptr);
+    a1->otId = PlayerProfile_GetTrainerID(profile);
+    CopyU16StringArray(a1->name, PlayerProfile_GetNamePtr(profile));
+    a1->unk18 = 0;
+    strcpy(a1->unk24, ptr2->unk0);
+    a1->unk5c = sub_020317BC(saveData, 0);
+
+    SaveSubstruct_UpdateCRC(SAVE_UNK_31);
+}
+
+s32 sub_0203186C(SAVEDATA *saveData, Unk020317F4 *a1) {
+    s32 rand;
+
+    sub_020317F4(saveData, a1);
+
+    rand = LCRandom() % 1000;
+    a1->unk60 = rand;
+    a1->unk62 = 0xffff;
+
+    SaveSubstruct_UpdateCRC(SAVE_UNK_31);
+    return rand;
+}
+
+void sub_0203189C(SAVEDATA *saveData, Unk020317F4 *a1) {
+    Unk0203170C *ptr = (Unk0203170C *)(SavArray_get(saveData, SAVE_UNK_31));
+
+    sub_020317F4(saveData, a1);
+
+    a1->unk60 = ptr->unk38;
+    a1->unk62 = ptr->unk3a;
+
+    SaveSubstruct_UpdateCRC(SAVE_UNK_31);
+}