You can catch Mew two (the person who wrote this is lying you have to go to currulean cave to catch mewtwo srry for getting your hopes up)
So you can catch the Pokemon's that are in there.
Catch zubat but that's it.
You can catch a Houndour in the Altering Cave in Pokemon FireRed.
Catch some zubat :P.
The only Pokemon you can catch is Zubat.(talk about a let down)
yes, sometimes at Altering Cave.
In Pokemon Leaf Green, you can catch Pokemon in the grass, water, or in a cave.
After national dex you find it at altering cave its Levels: 20 +
Yes, it is in Safari Zone (After you get the National Dex) and in Altering Cave.
Altering cave is on 5 or 6 island.
after moving the rocks in the altering cave to the right places it will say you heard a loud crash far away.however i havent figured that out yet
There are no moveable rocks in Altering Cave.