How To Get Entei/Suicune/Raikou in Pokémon FireRed/LeafGreen Version

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Note: You must become Pokémon League Champion before finding the Legendary 3 Dogs.
You must catch at least 60 Pokémon in order for Professor Oak to upgrade your Pokédex to the National Pokédex.
You must complete the Sevii Islands to retrieve the Ruby & Sapphire.
You must defeat Team Rocket after the End Credits. (You'll see them at Mt. Ember)

- If you chose Bulbasaur, you will find Entei.
- If you chose Charmander, you will find Suicune.
- If you chose Squirtle, you will find Raikou. (Like I did)

Alright, I was EXTREMELY LUCKY with this find, the legendary dogs travel each and every route once you enter and exit an area. Be sure to have a Pokémon under Level 50 so the Repel won't work for it to appear. Don't expect a quick find!! I was really lucky here:)

(I would advise you use the Master Ball for the 3 Legendary Dogs, they flee on the first turn).