diff --git a/asm/code_807E5AC.s b/asm/code_807E5AC.s
index f38ad3e7f..4012fcf22 100644
--- a/asm/code_807E5AC.s
+++ b/asm/code_807E5AC.s
@@ -5,196 +5,6 @@
 
   	.text
 
-	thumb_func_start sub_807EAA0
-sub_807EAA0:
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0xC
-	lsls r0, 24
-	lsrs r0, 24
-	str r0, [sp]
-	lsls r1, 24
-	lsrs r1, 24
-	str r1, [sp, 0x4]
-	movs r0, 0
-	mov r8, r0
-	movs r1, 0x1
-	negs r1, r1
-	mov r9, r1
-	movs r2, 0
-	str r2, [sp, 0x8]
-	bl GetApparentWeather
-	lsls r0, 24
-	lsrs r0, 24
-	mov r10, r0
-	movs r5, 0
-	ldr r7, _0807EAF0
-	ldr r6, _0807EAF4
-_0807EAD6:
-	ldr r3, [r7]
-	adds r0, r3, r6
-	adds r4, r0, r5
-	ldr r1, _0807EAF8
-	adds r0, r3, r1
-	adds r0, r5
-	ldrb r0, [r0]
-	ldrb r2, [r4]
-	adds r1, r0, 0
-	cmp r2, r1
-	bcs _0807EAFC
-	strb r0, [r4]
-	b _0807EB08
-	.align 2, 0
-_0807EAF0: .4byte gDungeon
-_0807EAF4: .4byte 0x0000e267
-_0807EAF8: .4byte 0x0000e26f
-_0807EAFC:
-	cmp r2, r1
-	bls _0807EB08
-	adds r0, r5, r6
-	adds r0, r3, r0
-	bl sub_80838EC
-_0807EB08:
-	ldr r0, [r7]
-	ldr r2, _0807EB38
-	adds r0, r2
-	adds r0, r5
-	ldrb r1, [r0]
-	ldr r0, _0807EB3C
-	cmp r8, r1
-	bge _0807EB1C
-	mov r8, r1
-	mov r9, r5
-_0807EB1C:
-	adds r5, 0x1
-	cmp r5, 0x7
-	ble _0807EAD6
-	mov r1, r9
-	cmp r1, 0
-	bge _0807EB44
-	ldr r0, [r0]
-	ldr r2, _0807EB40
-	adds r1, r0, r2
-	ldrb r1, [r1]
-	subs r2, 0x1
-	adds r0, r2
-	strb r1, [r0]
-	b _0807EB4E
-	.align 2, 0
-_0807EB38: .4byte 0x0000e267
-_0807EB3C: .4byte gDungeon
-_0807EB40: .4byte 0x0000e265
-_0807EB44:
-	ldr r0, [r0]
-	ldr r1, _0807EB94
-	adds r0, r1
-	mov r2, r9
-	strb r2, [r0]
-_0807EB4E:
-	ldr r0, _0807EB98
-	ldr r1, [r0]
-	ldr r2, _0807EB9C
-	adds r0, r1, r2
-	ldrb r0, [r0]
-	cmp r0, 0
-	beq _0807EB64
-	ldr r0, _0807EB94
-	adds r1, r0
-	movs r0, 0
-	strb r0, [r1]
-_0807EB64:
-	movs r0, 0
-	bl GetApparentWeather
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r10, r0
-	bne _0807EB78
-	ldr r1, [sp, 0x4]
-	cmp r1, 0
-	beq _0807EB82
-_0807EB78:
-	movs r2, 0x1
-	str r2, [sp, 0x8]
-	ldr r0, [sp]
-	bl sub_807E698
-_0807EB82:
-	ldr r0, _0807EB98
-	ldr r0, [r0]
-	ldr r2, _0807EBA0
-	adds r1, r0, r2
-	ldrb r0, [r1]
-	cmp r0, 0
-	beq _0807EBA4
-	subs r0, 0x1
-	b _0807EBA6
-	.align 2, 0
-_0807EB94: .4byte 0x0000e264
-_0807EB98: .4byte gDungeon
-_0807EB9C: .4byte 0x0000e279
-_0807EBA0: .4byte 0x0000e266
-_0807EBA4:
-	movs r0, 0x9
-_0807EBA6:
-	strb r0, [r1]
-	ldr r4, _0807EC14
-	ldr r0, [r4]
-	ldr r2, _0807EC18
-	adds r1, r0, r2
-	ldrb r0, [r1]
-	cmp r0, 0
-	beq _0807EBD4
-	adds r0, r1, 0
-	bl sub_80838EC
-	ldr r0, [r4]
-	ldr r1, _0807EC18
-	adds r0, r1
-	ldrb r0, [r0]
-	cmp r0, 0
-	bne _0807EBD4
-	bl GetLeader
-	ldr r1, _0807EC1C
-	ldr r1, [r1]
-	bl LogMessageByIdWithPopupCheckUser
-_0807EBD4:
-	ldr r4, _0807EC14
-	ldr r0, [r4]
-	ldr r2, _0807EC20
-	adds r1, r0, r2
-	ldrb r0, [r1]
-	cmp r0, 0
-	beq _0807EC00
-	adds r0, r1, 0
-	bl sub_80838EC
-	ldr r0, [r4]
-	ldr r1, _0807EC20
-	adds r0, r1
-	ldrb r0, [r0]
-	cmp r0, 0
-	bne _0807EC00
-	bl GetLeader
-	ldr r1, _0807EC24
-	ldr r1, [r1]
-	bl LogMessageByIdWithPopupCheckUser
-_0807EC00:
-	ldr r0, [sp, 0x8]
-	add sp, 0xC
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	.align 2, 0
-_0807EC14: .4byte gDungeon
-_0807EC18: .4byte 0x0000e277
-_0807EC1C: .4byte gUnknown_80FA778
-_0807EC20: .4byte 0x0000e278
-_0807EC24: .4byte gUnknown_80FA758
-	thumb_func_end sub_807EAA0
 
 	thumb_func_start sub_807EC28
 sub_807EC28:
diff --git a/data/data_80F4D44.s b/data/data_80F4D44.s
index be09bee4f..2ea765fd9 100644
--- a/data/data_80F4D44.s
+++ b/data/data_80F4D44.s
@@ -16,4 +16,4 @@ gUnknown_80F4D64: @ 80F4D64
 gUnknown_80F4D8C: @ 80F4D8C
         @ replacing .incbin "baserom.gba", 0x000f4d8c, 0x14
         .string "mapparam\0"
-        .align 2,0
\ No newline at end of file
+        .align 2,0
diff --git a/include/structs/str_dungeon.h b/include/structs/str_dungeon.h
index c751ce3a0..78c4bd342 100644
--- a/include/structs/str_dungeon.h
+++ b/include/structs/str_dungeon.h
@@ -20,7 +20,7 @@
 #define DUNGEON_MAX_ITEMS 64
 
 // size: 0x18
-typedef struct Weather
+typedef struct Weather // 0xE264
 {
     /* 0x0 */ u8 weather; // Uses the weather constants in weather.h.
     /* 0x1 */ u8 unkE265; // Uses the weather constants in weather.h
diff --git a/src/code_807E5AC.c b/src/code_807E5AC.c
index 34e6de0fb..ed75d107d 100644
--- a/src/code_807E5AC.c
+++ b/src/code_807E5AC.c
@@ -26,11 +26,14 @@ extern s32 GetMonsterApparentID(Entity *pokemon, s32 id);
 void sub_803E874(bool8 r10, s32 r9);
 void GetWeatherName(u8 *dst, u8 weatherId);
 extern s32 CalculateStatusTurns(Entity *target, const s16 *turnRange, bool8 factorCurerSkills);
+extern void sub_80838EC(u8 *a);
 
 void sub_807E7FC(bool8 arg0);
 void sub_807E8F0(Entity *pokemon);
 
 extern const u8 *const gUnknown_80FC5E0;
+extern const u8 *const gUnknown_80FA778;
+extern const u8 *const gUnknown_80FA758;
 
 // Note: gUnknown_202ECA0 file's 2d array is read as 1d array in functions below, be careful!
 void sub_807E698(bool8 arg0)
@@ -202,3 +205,64 @@ void MudWaterSportEffect(u8 which)
         LogMessageByIdWithPopupCheckUser(GetLeader(), gUnknown_80FADB0);
     }
 }
+
+bool8 sub_807EAA0(bool8 arg0, bool8 arg1)
+{
+    s32 i;
+    s32 var = 0;
+    s32 index = -1;
+    bool8 ret = FALSE;
+    s32 weatherBefore = GetApparentWeather(NULL);
+
+    for (i = 0; i < 8; i++) {
+        if (gDungeon->weather.unkE267[i] < gDungeon->weather.naturalWeather[i]) {
+            gDungeon->weather.unkE267[i] = gDungeon->weather.naturalWeather[i];
+        }
+        else if (gDungeon->weather.unkE267[i] > gDungeon->weather.naturalWeather[i]) {
+            sub_80838EC(&gDungeon->weather.unkE267[i]);
+        }
+
+        if (var < gDungeon->weather.unkE267[i]) {
+            var = gDungeon->weather.unkE267[i];
+            index = i;
+        }
+    }
+
+    if (index < 0) {
+        gDungeon->weather.weather = gDungeon->weather.unkE265;
+    }
+    else {
+        gDungeon->weather.weather = index;
+    }
+
+    if (gDungeon->weather.nullifyWeather) {
+        gDungeon->weather.weather = 0;
+    }
+
+    if (weatherBefore != GetApparentWeather(NULL) || arg1) {
+        ret = TRUE;
+        sub_807E698(arg0);
+    }
+
+    if (gDungeon->weather.weatherDamageCounter != 0) {
+        gDungeon->weather.weatherDamageCounter--;
+    }
+    else {
+        gDungeon->weather.weatherDamageCounter = 9;
+    }
+
+    if (gDungeon->weather.mudSportTurns != 0) {
+        sub_80838EC(&gDungeon->weather.mudSportTurns);
+        if (gDungeon->weather.mudSportTurns == 0) {
+            LogMessageByIdWithPopupCheckUser(GetLeader(), gUnknown_80FA778);
+        }
+    }
+    if (gDungeon->weather.waterSportTurns != 0) {
+        sub_80838EC(&gDungeon->weather.waterSportTurns);
+        if (gDungeon->weather.waterSportTurns == 0) {
+            LogMessageByIdWithPopupCheckUser(GetLeader(), gUnknown_80FA758);
+        }
+    }
+
+    return ret;
+}
diff --git a/src/dungeon_config.c b/src/dungeon_config.c
index d6408c0d6..ca4fc5ed9 100644
--- a/src/dungeon_config.c
+++ b/src/dungeon_config.c
@@ -1130,4 +1130,3 @@ const struct CalledMove gNaturePowerCalledMoves[] =
     {MOVE_SURF, HandleRegularDamagingMove},
     {MOVE_ROCK_SLIDE, HandleRegularDamagingMove},
 };
-