Jesus Christ...U DO NOT GET THEM IN THE ALTERING CAVE!!! u find them roaming around Kanto after beating the the elite four. U get one according to the starter.
Charmander=Suicune
Squirtle=Raikou
Bulbasaur=Entei
I suggest using max repels. They are lv. 50, so put a Pokemon that is lv.50 or lower at the front of your team and look for them if they r in the same route as u. Of course put them to sleep they are runners (meaning they will run away from you right after making your move).
The hardest part is looking for them. If somehow u met him while looking through grass, the pokedex will register their picture and location. So check your pokedex often to see if u r in the same route as it.
(It was a pain finding them in gold, I sure it will be the same in Firered.)
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Routes 13, 14, 15, Pokémon Mansion, Cerulean Cave, go to bulbapedia.com it has alot of info
shoal cave, but it is very rare
They can be found in the dark cave but they are rare.
go right from mahogany town and then go in to the cave and it will be icy it is (a bit) rare (i mean only a bit rare)
You have to get sandshrew in waywards cave but its also pretty rare to get him in there