diff --git a/constants/map_constants.asm b/constants/map_constants.asm
index f217628..99eede9 100644
--- a/constants/map_constants.asm
+++ b/constants/map_constants.asm
@@ -600,7 +600,7 @@ ENDM
 	map_const GREEN_PATH,							10, 10 ; 5
 	map_const PATTERN_BUSH,							10, 10 ; 6
 	map_const OUTCAST_ISLAND,						10, 10 ; 7
-	map_const ALTERING_CAVE,						10, 10 ; 8
+	map_const ALTERING_CAVE,						18, 15 ; 8
 	endgroup
 	
 	newgroup SEVEN_ISLAND ; 34
diff --git a/data/wild/kanto_grass.asm b/data/wild/kanto_grass.asm
index aed7466..aebd4bf 100644
--- a/data/wild/kanto_grass.asm
+++ b/data/wild/kanto_grass.asm
@@ -930,4 +930,32 @@ KantoGrassWildMons:
 	dbw 42, GENGAR
 	end_grass_wildmons
 
+	def_grass_wildmons ALTERING_CAVE
+	db 4 percent, 2 percent, 8 percent ; encounter rates: morn/day/nite
+	; morn
+	dbw 45, ZUBAT
+	dbw 46, MAREEP
+	dbw 46, ZUBAT
+	dbw 46, AIPOM
+	dbw 49, PINECO
+	dbw 48, TEDDIURSA
+	dbw 49, SMEARGLE
+	; day
+	dbw 45, ZUBAT
+	dbw 46, MAREEP
+	dbw 46, ZUBAT
+	dbw 46, AIPOM
+	dbw 49, PINECO
+	dbw 48, TEDDIURSA
+	dbw 49, STANTLER
+	; nite
+	dbw 45, ZUBAT
+	dbw 46, MAREEP
+	dbw 46, ZUBAT
+	dbw 46, AIPOM
+	dbw 49, PINECO
+	dbw 48, TEDDIURSA
+	dbw 49, HOUNDOUR
+	end_grass_wildmons
+	
 	db -1 ; end
diff --git a/maps/AlteringCave.ablk b/maps/AlteringCave.ablk
index eeb5760..891acd4 100644
Binary files a/maps/AlteringCave.ablk and b/maps/AlteringCave.ablk differ
diff --git a/maps/AlteringCave.asm b/maps/AlteringCave.asm
index bc6a99f..19b3bca 100644
--- a/maps/AlteringCave.asm
+++ b/maps/AlteringCave.asm
@@ -9,6 +9,7 @@ AlteringCave_MapEvents:
 	db 0, 0 ; filler
 
 	def_warp_events
+	warp_event 17, 27, DEBUG_ROOM, 1 ; Will be Outcast Island
 
 	def_coord_events