diff --git a/asm/include/main_0205BC30.inc b/asm/include/main_0205BC94.inc
similarity index 99%
rename from asm/include/main_0205BC30.inc
rename to asm/include/main_0205BC94.inc
index e4ad038a..5b78506f 100644
--- a/asm/include/main_0205BC30.inc
+++ b/asm/include/main_0205BC94.inc
@@ -371,7 +371,6 @@
 .public sub_02051134
 .public sub_02051620
 .public sub_02051648
-.public sub_02051788
 .public sub_02052C3C
 .public sub_02052E2C
 .public sub_02054F18
@@ -379,7 +378,6 @@
 .public sub_02055474
 .public sub_020554D8
 .public sub_020555D0
-.public sub_02055F04
 .public sub_020568A4
 .public sub_02056914
 .public sub_02056D70
diff --git a/asm/main_0205BC30.s b/asm/main_0205BC94.s
similarity index 99%
rename from asm/main_0205BC30.s
rename to asm/main_0205BC94.s
index 15a2da06..bf0b28f7 100644
--- a/asm/main_0205BC30.s
+++ b/asm/main_0205BC94.s
@@ -1,39 +1,8 @@
 	.include "asm/macros.inc"
-	.include "main_0205BC30.inc"
+	.include "main_0205BC94.inc"
 
 	.text
 
-	arm_func_start sub_0205BC30
-sub_0205BC30: ; 0x0205BC30
-	stmdb sp!, {r4, lr}
-	mov r4, r1
-	cmp r0, #0
-	bne _0205BC58
-	ldr r0, _0205BC90 ; =_020B0A54
-	mov r1, #0
-	ldr r0, [r0, #8]
-	mov r2, #0x44
-	bl MemsetSimple
-	ldmia sp!, {r4, pc}
-_0205BC58:
-	ldr r2, _0205BC90 ; =_020B0A54
-	mov r1, r0
-	ldr r0, [r2, #8]
-	bl sub_02055F04
-	cmp r4, #0
-	ldmneia sp!, {r4, pc}
-	ldr r0, _0205BC90 ; =_020B0A54
-	ldr r0, [r0, #8]
-	ldrb r0, [r0, #2]
-	bl sub_02051788
-	ldr r1, _0205BC90 ; =_020B0A54
-	ldr r1, [r1, #8]
-	strb r0, [r1, #2]
-	ldmia sp!, {r4, pc}
-	.align 2, 0
-_0205BC90: .word _020B0A54
-	arm_func_end sub_0205BC30
-
 	arm_func_start sub_0205BC94
 sub_0205BC94: ; 0x0205BC94
 	ldr r1, _0205BCC0 ; =_020B0A54
diff --git a/include/main_0205BC30.h b/include/main_0205BC30.h
new file mode 100644
index 00000000..a42baf1d
--- /dev/null
+++ b/include/main_0205BC30.h
@@ -0,0 +1,6 @@
+#ifndef PMDSKY_MAIN_0205BC30_H
+#define PMDSKY_MAIN_0205BC30_H
+
+void sub_0205BC30(u32 a, u32 b);
+
+#endif //PMDSKY_MAIN_0205BC30_H
diff --git a/main.lsf b/main.lsf
index 89a71b8f..140e08f4 100644
--- a/main.lsf
+++ b/main.lsf
@@ -157,7 +157,8 @@ Static main
 	Object src/main_0205B9C8.o
 	Object asm/main_0205BA0C.o
 	Object src/main_0205BBFC.o
-	Object asm/main_0205BC30.o
+	Object src/main_0205BC30.o
+	Object asm/main_0205BC94.o
 	Object src/dungeon_init_2.o
 	Object asm/main_0206A750.o
 	Object src/main_0206C98C.o
diff --git a/src/main_0205BC30.c b/src/main_0205BC30.c
new file mode 100644
index 00000000..0a15d337
--- /dev/null
+++ b/src/main_0205BC30.c
@@ -0,0 +1,37 @@
+#include "main_0205BC30.h"
+#include "main_0200330C.h"
+
+struct unkStruct_020B0A54_inner {
+    u8 padding[2];
+    u8 val;
+};
+
+// Should match the struct in main_0205B690, but haven't gotten it to match yet.
+// https://decomp.me/scratch/e6YZI
+struct unkStruct_020B0A54 {
+    u8 padding[8];
+    struct unkStruct_020B0A54_inner *inner;
+};
+
+extern void sub_02055F04(struct unkStruct_020B0A54_inner *p, u32 a);
+extern u32 sub_02051788(u32 val);
+
+extern struct unkStruct_020B0A54 _020B0A54;
+
+void sub_0205BC30(u32 a, u32 b)
+{
+    if (a == 0)
+    {
+        MemsetSimple((u8*) _020B0A54.inner, 0, 0x44);
+        return;
+    }
+
+    sub_02055F04(_020B0A54.inner, a);
+
+    if (b != 0)
+    {
+        return;
+    }
+
+    _020B0A54.inner->val = (u8)sub_02051788(_020B0A54.inner->val);
+}