Altering Cave

The Altering Cave is found in Pokémon Emerald, FireRed and LeafGreen. At first only Zubat can be found in this cave, but by using Mystery Gift other Pokémon such as Houndour and Stantler can be unlocked.

Locations

Location in Fire Red and Leaf Green

In Pokémon FireRed and Pokémon LeafGreen, the Altering Cave is found north of Chrono Island (also known as Five Island)

Location in Emerald

In Pokemon Emerald, the Altering cave is found on Route 103. Heading north from Oldale Town, it is across the river. Coming from Route 110, head East onto Route 103 and keep on the main path.