How to Get Crobat in Pokémon Emerald: 15 Steps (with Pictures)
Altering Cave - Bulbapedia, the community-driven Pokémon encyclopedia
Artisan Cave - Bulbapedia, the community-driven Pokémon encyclopedia
Pokemon Emerald Part #67 - Look at Altering Cave and Laugh
[3] Shiny Houndour after 65,670 REs ( no not joking) in Altering cave to clear up one of my older hunts now i can move onto the rest of Altering cave. : r/ShinyPokemon
Pokemon Emerald Event Distribution Service: Mystic Aurora Eon Ticket Old Sea Map | eBay
Pokémon Emerald - Altering Cave
How to Get Crobat in Pokémon Emerald: 15 Steps (with Pictures)