diff --git a/asm/map_obj_8097404.s b/asm/map_obj_8097404.s
index 3433f64f6..a58096701 100644
--- a/asm/map_obj_8097404.s
+++ b/asm/map_obj_8097404.s
@@ -5,375 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_8097BB4
-sub_8097BB4: @ 8097BB4
-	push {r4,r5,lr}
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, 24
-	lsrs r5, r1, 24
-	bl sub_8097B2C
-	adds r1, r0, 0
-	cmp r1, 0x40
-	beq _08097C3E
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r4, r0, r1
-	adds r0, r5, 0
-	bl GetFieldObjectGraphicsInfo
-	ldrh r3, [r4, 0x4]
-	lsls r3, 22
-	ldr r1, [r0, 0x10]
-	ldr r2, [r1, 0x4]
-	ldr r1, [r1]
-	str r1, [r4]
-	str r2, [r4, 0x4]
-	lsrs r3, 22
-	ldrh r2, [r4, 0x4]
-	ldr r1, =0xfffffc00
-	ands r1, r2
-	orrs r1, r3
-	strh r1, [r4, 0x4]
-	ldrb r2, [r0, 0xC]
-	lsls r2, 28
-	lsrs r2, 24
-	ldrb r3, [r4, 0x5]
-	movs r1, 0xF
-	ands r1, r3
-	orrs r1, r2
-	strb r1, [r4, 0x5]
-	ldr r1, [r0, 0x1C]
-	str r1, [r4, 0xC]
-	ldr r1, [r0, 0x14]
-	cmp r1, 0
-	bne _08097C20
-	str r1, [r4, 0x18]
-	adds r0, r4, 0
-	adds r0, 0x42
-	strb r1, [r0]
-	b _08097C36
-	.pool
-_08097C20:
-	adds r0, r4, 0
-	bl SetSubspriteTables
-	adds r2, r4, 0
-	adds r2, 0x42
-	ldrb r0, [r2]
-	movs r1, 0x3F
-	ands r1, r0
-	movs r0, 0x80
-	orrs r1, r0
-	strb r1, [r2]
-_08097C36:
-	adds r0, r4, 0
-	movs r1, 0
-	bl StartSpriteAnim
-_08097C3E:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8097BB4
-
-	thumb_func_start sub_8097C44
-sub_8097C44: @ 8097C44
-	push {r4,lr}
-	adds r4, r1, 0
-	lsls r0, 24
-	lsrs r0, 24
-	bl sub_8097B2C
-	lsls r0, 24
-	lsrs r2, r0, 24
-	adds r3, r2, 0
-	cmp r2, 0x40
-	beq _08097C80
-	cmp r4, 0
-	beq _08097C74
-	ldr r0, =gSprites
-	lsls r1, r2, 4
-	adds r1, r2
-	lsls r1, 2
-	adds r1, r0
-	movs r0, 0x1
-	strh r0, [r1, 0x32]
-	b _08097C80
-	.pool
-_08097C74:
-	ldr r1, =gSprites
-	lsls r0, r3, 4
-	adds r0, r3
-	lsls r0, 2
-	adds r0, r1
-	strh r4, [r0, 0x32]
-_08097C80:
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8097C44
-
-	thumb_func_start sub_8097C8C
-sub_8097C8C: @ 8097C8C
-	push {lr}
-	lsls r0, 24
-	lsrs r0, 24
-	bl sub_8097B2C
-	lsls r0, 24
-	lsrs r2, r0, 24
-	cmp r2, 0x40
-	bne _08097CA2
-	movs r0, 0
-	b _08097CBA
-_08097CA2:
-	movs r3, 0
-	ldr r0, =gSprites
-	lsls r1, r2, 4
-	adds r1, r2
-	lsls r1, 2
-	adds r1, r0
-	movs r2, 0x32
-	ldrsh r0, [r1, r2]
-	cmp r0, 0x1
-	bne _08097CB8
-	movs r3, 0x1
-_08097CB8:
-	adds r0, r3, 0
-_08097CBA:
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_8097C8C
-
-	thumb_func_start sub_8097CC4
-sub_8097CC4: @ 8097CC4
-	push {r4,lr}
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, 24
-	lsrs r4, r1, 24
-	bl sub_8097B2C
-	lsls r0, 24
-	lsrs r2, r0, 24
-	cmp r2, 0x40
-	beq _08097CEA
-	ldr r0, =gSprites
-	lsls r1, r2, 4
-	adds r1, r2
-	lsls r1, 2
-	adds r1, r0
-	movs r0, 0
-	strh r4, [r1, 0x34]
-	strh r0, [r1, 0x36]
-_08097CEA:
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8097CC4
-
-	thumb_func_start sub_8097CF4
-sub_8097CF4: @ 8097CF4
-	push {lr}
-	adds r2, r0, 0
-	movs r1, 0x36
-	ldrsh r0, [r2, r1]
-	cmp r0, 0
-	beq _08097D06
-	cmp r0, 0x1
-	beq _08097D0E
-	b _08097D2C
-_08097D06:
-	strh r0, [r2, 0x26]
-	ldrh r0, [r2, 0x36]
-	adds r0, 0x1
-	strh r0, [r2, 0x36]
-_08097D0E:
-	ldrh r0, [r2, 0x26]
-	subs r0, 0x8
-	movs r3, 0
-	strh r0, [r2, 0x26]
-	lsls r0, 16
-	asrs r0, 16
-	movs r1, 0xA0
-	negs r1, r1
-	cmp r0, r1
-	bne _08097D2C
-	strh r3, [r2, 0x26]
-	movs r0, 0x1
-	strh r0, [r2, 0x32]
-	strh r3, [r2, 0x34]
-	strh r3, [r2, 0x36]
-_08097D2C:
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8097CF4
-
-	thumb_func_start sub_8097D30
-sub_8097D30: @ 8097D30
-	push {lr}
-	adds r1, r0, 0
-	movs r2, 0x36
-	ldrsh r0, [r1, r2]
-	cmp r0, 0
-	beq _08097D42
-	cmp r0, 0x1
-	beq _08097D4C
-	b _08097D5E
-_08097D42:
-	ldr r0, =0x0000ff60
-	strh r0, [r1, 0x26]
-	ldrh r0, [r1, 0x36]
-	adds r0, 0x1
-	strh r0, [r1, 0x36]
-_08097D4C:
-	ldrh r0, [r1, 0x26]
-	adds r0, 0x8
-	strh r0, [r1, 0x26]
-	lsls r0, 16
-	asrs r0, 16
-	cmp r0, 0
-	bne _08097D5E
-	strh r0, [r1, 0x34]
-	strh r0, [r1, 0x36]
-_08097D5E:
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8097D30
-
-	thumb_func_start sub_8097D68
-sub_8097D68: @ 8097D68
-	push {lr}
-	adds r1, r0, 0
-	movs r2, 0x34
-	ldrsh r0, [r1, r2]
-	cmp r0, 0x1
-	beq _08097D84
-	cmp r0, 0x1
-	bgt _08097D7E
-	cmp r0, 0
-	beq _08097D98
-	b _08097D94
-_08097D7E:
-	cmp r0, 0x2
-	beq _08097D8C
-	b _08097D94
-_08097D84:
-	adds r0, r1, 0
-	bl sub_8097D30
-	b _08097D98
-_08097D8C:
-	adds r0, r1, 0
-	bl sub_8097CF4
-	b _08097D98
-_08097D94:
-	movs r0, 0
-	strh r0, [r1, 0x34]
-_08097D98:
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8097D68
-
-	thumb_func_start sub_8097D9C
-sub_8097D9C: @ 8097D9C
-	push {lr}
-	lsls r0, 24
-	lsrs r0, 24
-	bl sub_8097B2C
-	lsls r0, 24
-	lsrs r2, r0, 24
-	cmp r2, 0x40
-	beq _08097DC0
-	ldr r0, =gSprites
-	lsls r1, r2, 4
-	adds r1, r2
-	lsls r1, 2
-	adds r1, r0
-	movs r2, 0x34
-	ldrsh r0, [r1, r2]
-	cmp r0, 0
-	bne _08097DC8
-_08097DC0:
-	movs r0, 0
-	b _08097DCA
-	.pool
-_08097DC8:
-	movs r0, 0x1
-_08097DCA:
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8097D9C
-
-	thumb_func_start oe_exec_and_other_stuff
-oe_exec_and_other_stuff: @ 8097DD0
-	push {r4,lr}
-	adds r4, r0, 0
-	adds r0, r1, 0
-	lsls r4, 24
-	lsrs r4, 24
-	ldr r1, =gFieldEffectArguments
-	adds r2, r1, 0x4
-	adds r3, r1, 0
-	adds r3, 0x8
-	bl FieldObjectGetLocalIdAndMap
-	adds r0, r4, 0
-	bl FieldEffectStart
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end oe_exec_and_other_stuff
-
-	thumb_func_start DoShadowFieldEffect
-DoShadowFieldEffect: @ 8097DF8
-	push {lr}
-	adds r1, r0, 0
-	ldrb r2, [r1, 0x2]
-	lsls r0, r2, 25
-	cmp r0, 0
-	blt _08097E10
-	movs r0, 0x40
-	orrs r0, r2
-	strb r0, [r1, 0x2]
-	movs r0, 0x3
-	bl oe_exec_and_other_stuff
-_08097E10:
-	pop {r0}
-	bx r0
-	thumb_func_end DoShadowFieldEffect
-
-	thumb_func_start DoRippleFieldEffect
-@ void DoRippleFieldEffect(struct npc_state *fieldObject, struct obj *object)
-DoRippleFieldEffect: @ 8097E14
-	push {r4,lr}
-	adds r4, r1, 0
-	ldrb r0, [r0, 0x5]
-	bl GetFieldObjectGraphicsInfo
-	ldr r2, =gFieldEffectArguments
-	movs r3, 0x20
-	ldrsh r1, [r4, r3]
-	str r1, [r2]
-	movs r3, 0x22
-	ldrsh r1, [r4, r3]
-	ldrh r0, [r0, 0xA]
-	lsls r0, 16
-	asrs r0, 17
-	adds r1, r0
-	subs r1, 0x2
-	str r1, [r2, 0x4]
-	movs r0, 0x97
-	str r0, [r2, 0x8]
-	movs r0, 0x3
-	str r0, [r2, 0xC]
-	movs r0, 0x5
-	bl FieldEffectStart
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end DoRippleFieldEffect
-
 	thumb_func_start sub_8097E50
 sub_8097E50: @ 8097E50
 	push {r4-r7,lr}
diff --git a/src/field_map_obj_helpers.c b/src/field_map_obj_helpers.c
index 1247a7cd7..b0f7442f4 100755
--- a/src/field_map_obj_helpers.c
+++ b/src/field_map_obj_helpers.c
@@ -1,15 +1,22 @@
 #include "global.h"
 #include "field_ground_effect.h"
 #include "field_map_obj.h"
+#include "field_effect.h"
+
+extern void sub_8097D68(struct Sprite *sprite);
 
 typedef void (*SpriteStepFunc)(struct Sprite *sprite, u8 dir);
 
-extern const s8 gUnknown_0850E7BA[];
-extern const s8 gUnknown_0850E772[];
-
+extern const struct Coords16 gUnknown_0850DB7C[4];
 extern s16 gUnknown_0850E768[];
 extern SpriteStepFunc *const gUnknown_0850E754[];
-extern const struct Coords16 gUnknown_0850DB7C[4];
+extern const s8 gUnknown_0850E772[];
+extern const s8 gUnknown_0850E7BA[];
+extern const s8 *const gUnknown_0850E834[];
+extern s16 gUnknown_0850E840[];
+extern u8 gUnknown_0850E846[];
+extern s16 gUnknown_0850E84A[];
+extern u8 gUnknown_0850E850[];
 
 bool8 FreezeMapObject(struct MapObject *mapObject)
 {
@@ -192,10 +199,6 @@ bool8 sub_8097758(struct Sprite *sprite)
     return result;
 }
 
-extern const s8 *const gUnknown_0850E834[];
-extern s16 gUnknown_0850E840[];
-extern u8 gUnknown_0850E846[];
-
 s16 sub_8097820(s16 a1, u8 a2)
 {
     return gUnknown_0850E834[a2][a1];
@@ -238,9 +241,6 @@ u8 sub_809785C(struct Sprite *sprite)
     return v2;
 }
 
-extern s16 gUnknown_0850E84A[];
-extern u8 gUnknown_0850E850[];
-
 u8 sub_80978E4(struct Sprite *sprite)
 {
     s16 v5[3];
@@ -328,8 +328,6 @@ void sub_80979D4(struct Sprite *sprite, bool8 invisible)
         sprite->invisible = 1;
 }
 
-extern void sub_8097D68(struct Sprite *sprite);
-
 void sub_8097AC8(struct Sprite *sprite)
 {
     sub_8097D68(sprite);
@@ -369,3 +367,159 @@ void sub_8097B78(u8 var1, u8 var2)
     if(spriteId != MAX_SPRITES)
         StartSpriteAnim(&gSprites[spriteId], FieldObjectDirectionToImageAnimId(var2));
 }
+
+void sub_8097BB4(u8 var1, u8 var2)
+{
+    int spriteId = sub_8097B2C(var1);
+
+    if(spriteId != MAX_SPRITES)
+    {
+        struct Sprite *sprite = &gSprites[spriteId];
+        const struct MapObjectGraphicsInfo *gfxInfo = GetFieldObjectGraphicsInfo(var2);
+        u16 tileNum = sprite->oam.tileNum;
+
+        sprite->oam = *gfxInfo->oam;
+        sprite->oam.tileNum = tileNum;
+        sprite->oam.paletteNum = gfxInfo->paletteSlot;
+        sprite->images = gfxInfo->images;
+
+        if(gfxInfo->subspriteTables == NULL)
+        {
+            sprite->subspriteTables = NULL;
+            sprite->subspriteTableNum = 0;
+            sprite->subspriteMode = 0;
+        }
+        else
+        {
+            SetSubspriteTables(sprite, gfxInfo->subspriteTables);
+            sprite->subspriteMode = 2;
+        }
+        StartSpriteAnim(sprite, 0);
+    }
+}
+
+void sub_8097C44(u8 var, bool32 var2)
+{
+    u8 spriteId = sub_8097B2C(var);
+
+    if(spriteId == MAX_SPRITES)
+        return;
+
+    if(var2)
+        gSprites[spriteId].data[2] = 1;
+    else
+        gSprites[spriteId].data[2] = 0;
+}
+
+bool32 sub_8097C8C(u8 var)
+{
+    u8 spriteId = sub_8097B2C(var);
+
+    if(spriteId == MAX_SPRITES)
+        return FALSE;
+
+    return (gSprites[spriteId].data[2] == TRUE);
+}
+
+void sub_8097CC4(u8 var1, u8 var2)
+{
+    u8 spriteId = sub_8097B2C(var1);
+
+    if(spriteId != MAX_SPRITES)
+    {
+        gSprites[spriteId].data[3] = var2;
+        gSprites[spriteId].data[4] = 0;
+    }
+}
+
+void sub_8097CF4(struct Sprite *sprite)
+{
+    switch(sprite->data[4])
+    {
+        case 0:
+            sprite->pos2.y = 0;
+            sprite->data[4]++;
+        case 1:
+            sprite->pos2.y -= 8;
+            if(sprite->pos2.y == -160)
+            {
+                sprite->pos2.y = 0;
+                sprite->data[2] = 1;
+                sprite->data[3] = 0;
+                sprite->data[4] = 0;
+            }
+    }
+}
+
+void sub_8097D30(struct Sprite *sprite)
+{
+    switch(sprite->data[4])
+    {
+        case 0:
+            sprite->pos2.y = -160;
+            sprite->data[4]++;
+        case 1:
+            sprite->pos2.y += 8;
+            if(sprite->pos2.y == 0)
+            {
+                sprite->data[3] = 0;
+                sprite->data[4] = 0;
+            }
+    }
+}
+
+void sub_8097D68(struct Sprite *sprite)
+{
+    switch(sprite->data[3])
+    {
+        case 1:
+            sub_8097D30(sprite);
+            break;
+        case 2:
+            sub_8097CF4(sprite);
+            break;
+        case 0:
+            break;
+        default:
+            sprite->data[3] = 0;
+            break;
+    }
+}
+
+bool32 sub_8097D9C(u8 var)
+{
+    u8 spriteId = sub_8097B2C(var);
+
+    if(spriteId == MAX_SPRITES)
+        return FALSE;
+
+    if(gSprites[spriteId].data[3] != FALSE)
+        return TRUE;
+
+    return FALSE;
+}
+
+u32 oe_exec_and_other_stuff(u8 fieldEffectId, struct MapObject *mapObject)
+{
+    FieldObjectGetLocalIdAndMap(mapObject, &gFieldEffectArguments[0], &gFieldEffectArguments[1], &gFieldEffectArguments[2]);
+    return FieldEffectStart(fieldEffectId);
+}
+
+void DoShadowFieldEffect(struct MapObject *mapObject)
+{
+    if (!mapObject->mapobj_bit_22)
+    {
+        mapObject->mapobj_bit_22 = 1;
+        oe_exec_and_other_stuff(FLDEFF_SHADOW, mapObject);
+    }
+}
+
+void DoRippleFieldEffect(struct MapObject *mapObject, struct Sprite *sprite)
+{
+    const struct MapObjectGraphicsInfo *gfxInfo = GetFieldObjectGraphicsInfo(mapObject->graphicsId);
+    gFieldEffectArguments[0] = sprite->pos1.x;
+    gFieldEffectArguments[1] = sprite->pos1.y + (gfxInfo->height >> 1) - 2;
+    gFieldEffectArguments[2] = 151;
+    gFieldEffectArguments[3] = 3;
+    FieldEffectStart(FLDEFF_RIPPLE);
+}