How many legendary Pokemon in fire red and where I can find it?

Well the only ones that you can catch in the wild are these. Moltres, found on Mt. Ember. Zapdos, found at the Power Plant. Articuno, inside the Seafoam Islands. Mewtwo, in the cave north of Cerulean City, you'll need to use Surf to get to it. You can only enter it after you've beaten the Elite Four. You can also get one of the three Legendary Dogs. It depends on which Starter you chose though. If you chose Bulbasaur you'll see Entei. If you picked Charmander you'll encounter Suicune. If you started with Squirtle you will run into Raikou. You should run into your Legendary Dog after you've beaten the Elite Four, it'll be roaming and will run away when you encounter it. So, make sure you have a Pokemon with a move to trap it, or save your Masterball for it. Anyway those are the only ones you can catch without cheating. The rest can only be gotten with an Action Replay, though there used to be an event for them but thats long over.

Bulbasaur = entie squrtle = raiko Charmander = suicne

Where can I find Suicune??