diff --git a/asm/union_room.s b/asm/union_room.s
index a310dcaa6..ec5d82918 100755
--- a/asm/union_room.s
+++ b/asm/union_room.s
@@ -5,250 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_8017580
-sub_8017580: @ 8017580
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	lsls r1, 24
-	lsrs r1, 24
-	cmp r1, 0
-	beq _080175D8
-	ldr r2, =gUnknown_082F045C
-	mov r8, r2
-	movs r5, 0
-	mov r9, r5
-	movs r6, 0x4
-	negs r6, r6
-	mov r12, r6
-	adds r2, r0, 0
-	adds r2, 0x18
-	adds r4, r0, 0
-	movs r7, 0xFF
-	mov r10, r7
-	adds r3, r1, 0
-_080175AC:
-	adds r1, r4, 0
-	mov r0, r8
-	ldm r0!, {r5-r7}
-	stm r1!, {r5-r7}
-	ldm r0!, {r5-r7}
-	stm r1!, {r5-r7}
-	mov r0, r10
-	strh r0, [r2]
-	ldrb r1, [r2, 0x2]
-	mov r0, r12
-	ands r0, r1
-	movs r1, 0x5
-	negs r1, r1
-	ands r0, r1
-	strb r0, [r2, 0x2]
-	mov r5, r9
-	strb r5, [r2, 0x3]
-	adds r2, 0x20
-	adds r4, 0x20
-	subs r3, 0x1
-	cmp r3, 0
-	bne _080175AC
-_080175D8:
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8017580
-
-	thumb_func_start sub_80175EC
-sub_80175EC: @ 80175EC
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	ldr r1, =gUnknown_082F045C
-	mov r12, r1
-	movs r5, 0x2
-	negs r5, r5
-	mov r8, r5
-	adds r2, r0, 0
-	adds r2, 0x18
-	adds r3, r0, 0
-	movs r4, 0x3
-_08017604:
-	adds r1, r3, 0
-	mov r0, r12
-	ldm r0!, {r5-r7}
-	stm r1!, {r5-r7}
-	ldm r0!, {r5-r7}
-	stm r1!, {r5-r7}
-	ldrb r1, [r2]
-	mov r0, r8
-	ands r0, r1
-	strb r0, [r2]
-	adds r2, 0x1C
-	adds r3, 0x1C
-	subs r4, 0x1
-	cmp r4, 0
-	bge _08017604
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_80175EC
-
-	thumb_func_start sub_8017630
-sub_8017630: @ 8017630
-	push {r4-r6,lr}
-	adds r5, r0, 0
-	adds r6, r1, 0
-	movs r2, 0
-	adds r4, r5, 0x2
-	adds r3, r6, 0x2
-_0801763C:
-	adds r0, r4, r2
-	adds r1, r3, r2
-	ldrb r0, [r0]
-	ldrb r1, [r1]
-	cmp r0, r1
-	bne _08017664
-	adds r2, 0x1
-	cmp r2, 0x1
-	ble _0801763C
-	movs r2, 0
-	adds r4, r5, 0
-	adds r4, 0x10
-	adds r3, r6, 0
-	adds r3, 0x10
-_08017658:
-	adds r0, r4, r2
-	adds r1, r3, r2
-	ldrb r0, [r0]
-	ldrb r1, [r1]
-	cmp r0, r1
-	beq _08017668
-_08017664:
-	movs r0, 0x1
-	b _08017670
-_08017668:
-	adds r2, 0x1
-	cmp r2, 0x7
-	ble _08017658
-	movs r0, 0
-_08017670:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8017630
-
-	thumb_func_start sub_8017678
-sub_8017678: @ 8017678
-	push {r4-r6,lr}
-	adds r5, r0, 0
-	adds r6, r1, 0
-	ldrb r3, [r5, 0xA]
-	movs r0, 0x7F
-	ldrb r2, [r6, 0xA]
-	adds r1, r0, 0
-	ands r1, r3
-	ands r0, r2
-	cmp r1, r0
-	bne _080176DC
-	movs r0, 0x80
-	adds r1, r0, 0
-	ands r1, r3
-	ands r0, r2
-	cmp r1, r0
-	bne _080176DC
-	movs r2, 0
-	adds r4, r5, 0x4
-	adds r3, r6, 0x4
-_080176A0:
-	adds r0, r4, r2
-	adds r1, r3, r2
-	ldrb r0, [r0]
-	ldrb r1, [r1]
-	cmp r0, r1
-	bne _080176DC
-	adds r2, 0x1
-	cmp r2, 0x3
-	ble _080176A0
-	ldrh r2, [r5, 0x8]
-	ldr r0, =0x000003ff
-	ldrh r3, [r6, 0x8]
-	adds r1, r0, 0
-	ands r1, r2
-	ands r0, r3
-	cmp r1, r0
-	bne _080176DC
-	ldrb r2, [r5, 0x9]
-	movs r0, 0xFC
-	ldrb r3, [r6, 0x9]
-	adds r1, r0, 0
-	ands r1, r2
-	ands r0, r3
-	cmp r1, r0
-	bne _080176DC
-	movs r0, 0
-	b _080176DE
-	.pool
-_080176DC:
-	movs r0, 0x1
-_080176DE:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8017678
-
-	thumb_func_start sub_80176E4
-sub_80176E4: @ 80176E4
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	mov r8, r0
-	movs r7, 0xFF
-	movs r6, 0
-	adds r4, r1, 0
-	adds r4, 0x18
-	adds r5, r1, 0
-_080176F6:
-	ldrb r1, [r4]
-	movs r0, 0x1
-	ands r0, r1
-	cmp r0, 0
-	beq _0801771E
-	mov r0, r8
-	adds r1, r5, 0
-	bl sub_8017630
-	lsls r0, 24
-	cmp r0, 0
-	bne _0801771E
-	lsls r0, r6, 24
-	lsrs r7, r0, 24
-	ldrb r0, [r4]
-	movs r2, 0x2
-	negs r2, r2
-	adds r1, r2, 0
-	ands r0, r1
-	strb r0, [r4]
-_0801771E:
-	adds r4, 0x1C
-	adds r5, 0x1C
-	adds r6, 0x1
-	cmp r6, 0x3
-	ble _080176F6
-	adds r0, r7, 0
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_80176E4
-
 	thumb_func_start sub_8017734
 sub_8017734: @ 8017734
 	push {r4-r7,lr}
diff --git a/src/union_room.c b/src/union_room.c
index 7a45724e5..620a13e58 100644
--- a/src/union_room.c
+++ b/src/union_room.c
@@ -228,7 +228,7 @@ u32 sub_8013B8C(struct UnkStruct_Group *arg0, s32 id);
 void sub_8013BD8(struct UnkStruct_Group *arg0, s32 id);
 void sub_80173D4(void);
 void sub_80177B8(u8 arg0, u8 arg1, u8 arg2, struct UnkStruct_x20 *arg3, u8 arg4, u8 id);
-bool32 sub_8017678(struct UnkStruct_x20 *arg0, struct UnkStruct_x1C *arg1);
+bool32 sub_8017678(struct UnkStruct_Shared *arg0, struct UnkStruct_Shared *arg1);
 u32 sub_8018120(struct TradeUnkStruct *arg0, u8 multiplayerId);
 void sub_801807C(struct TradeUnkStruct *arg0);
 void sub_801AC54(void);
@@ -1456,7 +1456,7 @@ u8 sub_8013E44(void)
             {
                 if (data->field_0->arr[i].field_1A_0 == 1)
                 {
-                    if (sub_8017678(&data->field_0->arr[i], &data->field_4->arr[id]))
+                    if (sub_8017678(&data->field_0->arr[i].unk, &data->field_4->arr[id].unk0))
                     {
                         data->field_0->arr[i].unk = data->field_4->arr[id].unk0;
                         data->field_0->arr[i].field_1B = 0x40;
@@ -3423,7 +3423,7 @@ u8 sub_8016B00(void)
             {
                 if (structPtr->field_0->arr[j].field_1A_0 == 1)
                 {
-                    if (sub_8017678(&structPtr->field_0->arr[j], &structPtr->field_4->arr[i]))
+                    if (sub_8017678(&structPtr->field_0->arr[j].unk, &structPtr->field_4->arr[i].unk0))
                     {
                         structPtr->field_0->arr[j].unk = structPtr->field_4->arr[i].unk0;
                         structPtr->field_0->arr[j].field_1B = 0x40;
@@ -4015,3 +4015,103 @@ void sub_80173E0(u8 windowId, u8 arg1, const u8 *str, u8 arg3, u8 arg4, u8 arg5)
 
     AddTextPrinter(&sp0, 0xFF, NULL);
 }
+
+void sub_8017580(struct UnkStruct_x20 *arg0, u8 count)
+{
+    s32 i;
+
+    for (i = 0; i < count; i++)
+    {
+        arg0[i].unk = gUnknown_082F045C;
+        arg0[i].field_18 = 0xFF;
+        arg0[i].field_1A_0 = 0;
+        arg0[i].field_1A_1 = 0;
+        arg0[i].field_1B = 0;
+    }
+}
+
+void sub_80175EC(struct UnkStruct_Main4 *arg0, u8 count)
+{
+    s32 i;
+
+    for (i = 0; i < 4; i++)
+    {
+        arg0->arr[i].unk0 = gUnknown_082F045C;
+        arg0->arr[i].unk18 = 0;
+    }
+}
+
+bool8 sub_8017630(struct UnkStruct_Shared* arg0, const struct UnkStruct_Shared* arg1)
+{
+    s32 i;
+
+    for (i = 0; i < 2; i++)
+    {
+        if (arg0->field_0.unk_00.playerTrainerId[i] != arg1->field_0.unk_00.playerTrainerId[i])
+        {
+            return TRUE;
+        }
+    }
+
+    for (i = 0; i < 8; i++)
+    {
+        if (arg0->playerName[i] != arg1->playerName[i])
+        {
+            return TRUE;
+        }
+    }
+
+    return FALSE;
+}
+
+bool32 sub_8017678(struct UnkStruct_Shared *arg0, struct UnkStruct_Shared *arg1)
+{
+    s32 i;
+
+    if (arg0->field_0.unk_0a_0 != arg1->field_0.unk_0a_0)
+    {
+        return TRUE;
+    }
+
+    if (arg0->field_0.unk_0a_7 != arg1->field_0.unk_0a_7)
+    {
+        return TRUE;
+    }
+
+    for (i = 0; i < 4; i++)
+    {
+        if (arg0->field_0.unk_04[i] != arg1->field_0.unk_04[i])
+        {
+            return TRUE;
+        }
+    }
+
+    if (arg0->field_0.species != arg1->field_0.species)
+    {
+        return TRUE;
+    }
+
+    if (arg0->field_0.type != arg1->field_0.type)
+    {
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+u32 sub_80176E4(struct UnkStruct_x20 *arg0, struct UnkStruct_x1C *arg1)
+{
+    u8 result = 0xFF;
+    s32 i;
+
+    for (i = 0; i < 4; i++)
+    {
+        if (arg1[i].unk18 && !sub_8017630(&arg0->unk, &arg1[i].unk0))
+        {
+            result = i;
+            arg1[i].unk18 = FALSE;
+        }
+    }
+
+    return result;
+}