diff --git a/asm/overlay_18.s b/asm/overlay_18.s
index eecac0f9f..76e78ea14 100644
--- a/asm/overlay_18.s
+++ b/asm/overlay_18.s
@@ -8,7 +8,6 @@
 	.extern ov18_021E590C
 	.extern ov18_021E595C
 	.extern ov18_021E59A8
-	.extern ov18_021E5E70
 	.extern ov18_021E613C
 	.extern ov18_021E66EC
 	.extern ov18_021E6714
@@ -31,269 +30,6 @@
 
 	.text
 
-	thumb_func_start PokedexApp_MainSeq_80
-PokedexApp_MainSeq_80: ; 0x021ECF58
-	push {r4, lr}
-	sub sp, #0x18
-	add r1, sp, #0x14
-	add r4, r0, #0
-	bl ov18_021F7D30
-	mov r1, #0
-	mvn r1, r1
-	cmp r0, r1
-	beq _021ECF70
-	cmp r0, #0xc
-	bls _021ECF72
-_021ECF70:
-	b _021ED144
-_021ECF72:
-	add r0, r0, r0
-	add r0, pc
-	ldrh r0, [r0, #6]
-	lsl r0, r0, #0x10
-	asr r0, r0, #0x10
-	add pc, r0
-_021ECF7E: ; jump table
-	.short _021ECF98 - _021ECF7E - 2 ; case 0
-	.short _021ECFBA - _021ECF7E - 2 ; case 1
-	.short _021ECFDC - _021ECF7E - 2 ; case 2
-	.short _021ECFFE - _021ECF7E - 2 ; case 3
-	.short _021ED014 - _021ECF7E - 2 ; case 4
-	.short _021ED042 - _021ECF7E - 2 ; case 5
-	.short _021ED06E - _021ECF7E - 2 ; case 6
-	.short _021ED09C - _021ECF7E - 2 ; case 7
-	.short _021ED042 - _021ECF7E - 2 ; case 8
-	.short _021ED09C - _021ECF7E - 2 ; case 9
-	.short _021ED0CA - _021ECF7E - 2 ; case 10
-	.short _021ED0F8 - _021ECF7E - 2 ; case 11
-	.short _021ED122 - _021ECF7E - 2 ; case 12
-_021ECF98:
-	ldr r0, [sp, #0x14]
-	cmp r0, #1
-	bne _021ECFA6
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	b _021ECFAC
-_021ECFA6:
-	ldr r0, _021ED150 ; =0x000008E8
-	bl PlaySE
-_021ECFAC:
-	add r0, r4, #0
-	mov r1, #0
-	mov r2, #1
-	bl ov18_021EC1DC
-	add sp, #0x18
-	pop {r4, pc}
-_021ECFBA:
-	ldr r0, [sp, #0x14]
-	cmp r0, #1
-	bne _021ECFC8
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	b _021ECFCE
-_021ECFC8:
-	ldr r0, _021ED150 ; =0x000008E8
-	bl PlaySE
-_021ECFCE:
-	add r0, r4, #0
-	mov r1, #0
-	mov r2, #2
-	bl ov18_021EC1DC
-	add sp, #0x18
-	pop {r4, pc}
-_021ECFDC:
-	ldr r0, [sp, #0x14]
-	cmp r0, #1
-	bne _021ECFEA
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	b _021ECFF0
-_021ECFEA:
-	ldr r0, _021ED150 ; =0x000008E8
-	bl PlaySE
-_021ECFF0:
-	add r0, r4, #0
-	mov r1, #0x10
-	mov r2, #0x50
-	bl ov18_021EDC28
-	add sp, #0x18
-	pop {r4, pc}
-_021ECFFE:
-	mov r0, #0x25
-	lsl r0, r0, #6
-	bl PlaySE
-	add r0, r4, #0
-	mov r1, #0
-	mov r2, #0xff
-	bl ov18_021EC1DC
-	add sp, #0x18
-	pop {r4, pc}
-_021ED014:
-	add r0, r4, #0
-	sub r1, r1, #1
-	mov r2, #2
-	bl ov18_021EDF14
-	cmp r0, #1
-	bne _021ED03C
-	ldr r0, [sp, #0x14]
-	cmp r0, #1
-	bne _021ED030
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	b _021ED036
-_021ED030:
-	ldr r0, _021ED150 ; =0x000008E8
-	bl PlaySE
-_021ED036:
-	add sp, #0x18
-	mov r0, #0x52
-	pop {r4, pc}
-_021ED03C:
-	add sp, #0x18
-	mov r0, #0x50
-	pop {r4, pc}
-_021ED042:
-	add r0, r4, #0
-	mov r2, #1
-	bl ov18_021EDF14
-	cmp r0, #1
-	bne _021ED068
-	ldr r0, [sp, #0x14]
-	cmp r0, #1
-	bne _021ED05C
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	b _021ED062
-_021ED05C:
-	ldr r0, _021ED150 ; =0x000008E8
-	bl PlaySE
-_021ED062:
-	add sp, #0x18
-	mov r0, #0x52
-	pop {r4, pc}
-_021ED068:
-	add sp, #0x18
-	mov r0, #0x50
-	pop {r4, pc}
-_021ED06E:
-	mov r1, #2
-	add r0, r4, #0
-	add r2, r1, #0
-	bl ov18_021EDF14
-	cmp r0, #1
-	bne _021ED096
-	ldr r0, [sp, #0x14]
-	cmp r0, #1
-	bne _021ED08A
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	b _021ED090
-_021ED08A:
-	ldr r0, _021ED150 ; =0x000008E8
-	bl PlaySE
-_021ED090:
-	add sp, #0x18
-	mov r0, #0x53
-	pop {r4, pc}
-_021ED096:
-	add sp, #0x18
-	mov r0, #0x50
-	pop {r4, pc}
-_021ED09C:
-	mov r1, #1
-	add r0, r4, #0
-	add r2, r1, #0
-	bl ov18_021EDF14
-	cmp r0, #1
-	bne _021ED0C4
-	ldr r0, [sp, #0x14]
-	cmp r0, #1
-	bne _021ED0B8
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	b _021ED0BE
-_021ED0B8:
-	ldr r0, _021ED150 ; =0x000008E8
-	bl PlaySE
-_021ED0BE:
-	add sp, #0x18
-	mov r0, #0x53
-	pop {r4, pc}
-_021ED0C4:
-	add sp, #0x18
-	mov r0, #0x50
-	pop {r4, pc}
-_021ED0CA:
-	add r0, sp, #0x10
-	add r1, sp, #0xc
-	bl System_GetTouchHeldCoords
-	ldr r1, [sp, #0x10]
-	ldr r2, [sp, #0xc]
-	add r0, r4, #0
-	bl ov18_021F6258
-	cmp r0, #1
-	bne _021ED0E6
-	add sp, #0x18
-	mov r0, #0x54
-	pop {r4, pc}
-_021ED0E6:
-	ldr r0, _021ED154 ; =0x00000868
-	add r1, r4, r0
-	ldr r0, [sp, #0x10]
-	strh r0, [r1]
-	ldr r0, [sp, #0xc]
-	add sp, #0x18
-	strh r0, [r1, #2]
-	mov r0, #0x55
-	pop {r4, pc}
-_021ED0F8:
-	ldr r0, _021ED158 ; =0x000018C4
-	ldrsb r0, [r4, r0]
-	cmp r0, #1
-	beq _021ED144
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	mov r0, #0xf
-	str r0, [sp]
-	mov r0, #2
-	str r0, [sp, #4]
-	mov r0, #0x56
-	mov r2, #0x11
-	str r0, [sp, #8]
-	add r0, r4, #0
-	mov r1, #0
-	add r3, r2, #0
-	bl ov18_021EDC50
-	add sp, #0x18
-	pop {r4, pc}
-_021ED122:
-	ldr r0, [sp, #0x14]
-	cmp r0, #1
-	bne _021ED130
-	ldr r0, _021ED14C ; =0x000008E9
-	bl PlaySE
-	b _021ED136
-_021ED130:
-	ldr r0, _021ED150 ; =0x000008E8
-	bl PlaySE
-_021ED136:
-	add r0, r4, #0
-	mov r1, #0
-	mov r2, #4
-	bl ov18_021EC1DC
-	add sp, #0x18
-	pop {r4, pc}
-_021ED144:
-	mov r0, #0x50
-	add sp, #0x18
-	pop {r4, pc}
-	nop
-_021ED14C: .word 0x000008E9
-_021ED150: .word 0x000008E8
-_021ED154: .word 0x00000868
-_021ED158: .word 0x000018C4
-	thumb_func_end PokedexApp_MainSeq_80
-
 	thumb_func_start PokedexApp_MainSeq_81
 PokedexApp_MainSeq_81: ; 0x021ED15C
 	push {r4, r5, lr}
diff --git a/include/application/pokedex/pokedex_internal.h b/include/application/pokedex/pokedex_internal.h
index 486fcd08d..fede62924 100644
--- a/include/application/pokedex/pokedex_internal.h
+++ b/include/application/pokedex/pokedex_internal.h
@@ -388,6 +388,7 @@ int ov18_021EDBB8(PokedexAppData *pokedexApp, int a1, int a2, int a3);
 int ov18_021EDBDC(PokedexAppData *pokedexApp, int a1, int a2, int a3);
 int ov18_021EDC00(PokedexAppData *pokedexApp, int a1, int a2, int a3, int a4, int a5);
 int ov18_021EDC28(PokedexAppData *pokedexApp, int a1, int a2);
+int ov18_021EDC50(PokedexAppData *pokedexApp, int a1, int a2, int a3, int a4, int a5, int a6);
 void ov18_021EDC74(PokedexAppData *pokedexApp, int a1);
 void ov18_021EDCD4(PokedexAppData *pokedexApp);
 void ov18_021EDDA4(PokedexAppData *pokedexApp, int a1);
@@ -396,6 +397,7 @@ int ov18_021EDE04(PokedexAppData *pokedexApp);
 void ov18_021EDE4C(PokedexAppData *pokedexApp, int a1, int a2, int a3);
 void ov18_021EDE64(PokedexAppData *pokedexApp);
 void ov18_021EDEB0(PokedexAppData *pokedexApp);
+int ov18_021EDF14(PokedexAppData *pokedexApp, int a1, int a2);
 void ov18_021EE068(PokedexAppData *pokedexApp);
 void ov18_021EE0CC(PokedexAppData *pokedexApp);
 int ov18_021EE0F0(PokedexAppData *pokedexApp, int a1, int a2);
@@ -520,6 +522,7 @@ void ov18_021F4A50(PokedexAppData *pokedexApp);
 void ov18_021F5DC0(PokedexAppData *pokedexApp);
 void ov18_021F5DE0(PokedexAppData *pokedexApp);
 void ov18_021F619C(PokedexAppData *pokedexApp, s8 a1, s8 a2, int a3);
+int ov18_021F6258(PokedexAppData *pokedexApp, int a1, int a2);
 int ov18_021F62B4(PokedexAppData *pokedexApp, u32 x, u32 y);
 BOOL ov18_021F63DC(PokedexAppData *pokedexApp, u32 x, u32 y);
 int ov18_021F64F4(PokedexAppData *pokedexApp, int a1);
@@ -549,6 +552,7 @@ u32 ov18_021F7974(PokedexAppData *pokedexApp, int a1);
 void ov18_021F7B74(PokedexAppData *pokedexApp);
 u32 ov18_021F7C14(PokedexAppData *pokedexApp, u32 *a1);
 u32 ov18_021F7D00(PokedexAppData *pokedexApp, u32 *a1);
+u32 ov18_021F7D30(PokedexAppData *pokedexApp, u32 *a1);
 void ov18_021F7ED4(PokedexAppData *pokedexApp, u8 a1, u32 a2, u32 a3, u32 a4, u32 a5, u32 a6, u32 a7, u32 a8, u32 a9, u32 a10, u32 a11);
 u32 ov18_021F8824(PokedexAppData *pokedexApp);
 u16 ov18_021F8838(PokedexAppData *pokedexApp);
diff --git a/src/application/pokedex/ov18_021E8BF4.c b/src/application/pokedex/ov18_021E8BF4.c
index 2a90f9576..c68279552 100644
--- a/src/application/pokedex/ov18_021E8BF4.c
+++ b/src/application/pokedex/ov18_021E8BF4.c
@@ -2871,3 +2871,110 @@ int PokedexApp_MainSeq_79(PokedexAppData *pokedexApp) {
 
     return POKEDEXAPP_MAINSEQ_79;
 }
+
+int PokedexApp_MainSeq_80(PokedexAppData *pokedexApp) {
+    u32 sp14;
+
+    switch (ov18_021F7D30(pokedexApp, &sp14)) {
+    case 0:
+        if (sp14 == 1) {
+            PlaySE(SEQ_SE_GS_ZKN04);
+        } else {
+            PlaySE(SEQ_SE_GS_ZKN03);
+        }
+        return ov18_021EC1DC(pokedexApp, 0, 1);
+    case 1:
+        if (sp14 == 1) {
+            PlaySE(SEQ_SE_GS_ZKN04);
+        } else {
+            PlaySE(SEQ_SE_GS_ZKN03);
+        }
+        return ov18_021EC1DC(pokedexApp, 0, 2);
+    case 2:
+        if (sp14 == 1) {
+            PlaySE(SEQ_SE_GS_ZKN04);
+        } else {
+            PlaySE(SEQ_SE_GS_ZKN03);
+        }
+        return ov18_021EDC28(pokedexApp, 16, 80);
+    case 3:
+        PlaySE(SEQ_SE_GS_GEARCANCEL);
+        return ov18_021EC1DC(pokedexApp, 0, 255);
+    case 4:
+        if (ov18_021EDF14(pokedexApp, -2, 2) == 1) {
+            if (sp14 == 1) {
+                PlaySE(SEQ_SE_GS_ZKN04);
+            } else {
+                PlaySE(SEQ_SE_GS_ZKN03);
+            }
+            return POKEDEXAPP_MAINSEQ_82;
+        } else {
+            return POKEDEXAPP_MAINSEQ_80;
+        }
+    case 5:
+    case 8:
+        if (ov18_021EDF14(pokedexApp, -1, 1) == 1) {
+            if (sp14 == 1) {
+                PlaySE(SEQ_SE_GS_ZKN04);
+            } else {
+                PlaySE(SEQ_SE_GS_ZKN03);
+            }
+            return POKEDEXAPP_MAINSEQ_82;
+        } else {
+            return POKEDEXAPP_MAINSEQ_80;
+        }
+    case 6:
+        if (ov18_021EDF14(pokedexApp, 2, 2) == 1) {
+            if (sp14 == 1) {
+                PlaySE(SEQ_SE_GS_ZKN04);
+            } else {
+                PlaySE(SEQ_SE_GS_ZKN03);
+            }
+            return POKEDEXAPP_MAINSEQ_83;
+        } else {
+            return POKEDEXAPP_MAINSEQ_80;
+        }
+    case 7:
+    case 9:
+        if (ov18_021EDF14(pokedexApp, 1, 1) == 1) {
+            if (sp14 == 1) {
+                PlaySE(SEQ_SE_GS_ZKN04);
+            } else {
+                PlaySE(SEQ_SE_GS_ZKN03);
+            }
+            return POKEDEXAPP_MAINSEQ_83;
+        } else {
+            return POKEDEXAPP_MAINSEQ_80;
+        }
+    case 10: {
+        u32 x, y;
+        System_GetTouchHeldCoords(&x, &y);
+        if (ov18_021F6258(pokedexApp, x, y) == 1) {
+            return POKEDEXAPP_MAINSEQ_84;
+        } else {
+            PokedexAppData_UnkSub0868_State16 *r1 = &pokedexApp->unk_0868.state_16;
+
+            r1->unk_0 = x;
+            r1->unk_2 = y;
+            return POKEDEXAPP_MAINSEQ_85;
+        }
+    } break;
+    case 11:
+        if (pokedexApp->numSeenForms != 1) {
+            PlaySE(SEQ_SE_GS_ZKN04);
+            return ov18_021EDC50(pokedexApp, 0, 17, 17, 15, 2, POKEDEXAPP_MAINSEQ_86);
+        }
+        break;
+    case 12:
+        if (sp14 == 1) {
+            PlaySE(SEQ_SE_GS_ZKN04);
+        } else {
+            PlaySE(SEQ_SE_GS_ZKN03);
+        }
+        return ov18_021EC1DC(pokedexApp, 0, 4);
+    case -1:
+        break;
+    }
+
+    return POKEDEXAPP_MAINSEQ_80;
+}