In Pokémon FireRed and LeafGreen, in the Sevii Islands, the cave is found on Outcast Island. In Pokémon Emerald, in the Hoenn region, it is found on Route 103. However unlike in in FireRed and LeafGreen, the cave appears only after the player makes it to the Hall of Fame. Also, the interior of the Altering Cave in Emerald differs from the one in FireRed and LeadGreen.
For normal circumstances only Zubat are found in the cave, but by recieving a Mystery Gift through the "Wonder Spot" event sponsored by Nintendo, the area of Pokémon will be altered. However, the event was never hailed so the event only Pokémon could never be found here. The event only Pokémon included: Mareep, Aipom, Pineco, Shuckle, Teddiursa, Houndour, Stantler and Smeargle.
| Wild Pokémon|
Unreleased event Pokémon