I believe you mean "Entei in Firered," Right? You can catch one of three dogs, DEPENDING ON YOUR STARTER. If you want Entei, I REALLY hope you picked bulbasaur. I also hope you saved your masterball for it. If not, Diglett sometimes have the ability "Arena Trap." Wobbuffet usually have "Shadow Tag." Both abilities prevent the opponent from escaping. HOWEVER! I strongly suggest getting a really fast Pokemon that learns "Mean Look" (And for Entei, a Pokemon that can use TM "Taunt.") Mean Look prevents enemy from escaping. Since Entei knows Roar, (Which ends the battle...) Use taunt every few turns. (Taunt only allows the query to use moves that take Hit Points away so Roar cannot be used. Wish ya luck.
I CATCH IT THAT'S ALL. OH BUT DONT WASTE YOUR MASTER BALL ON ANOTHER POKEMON. WASTE IT ON MEWTWO.
ITs at the bottom of island six in a place called dotted hole
A Weedle.
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You can only catch them in Pokemon fire red.
You cant catch any trainers Pokemon
You cnnot catch it in Pokemon fire red ,but you can catch it in Pokemon Diamond and Pearl.If you want it to be in your fire red,you will have to migrate it from your Diamond/pearl to your fire red.
The old man shows you how to catch pokemon.
Unfortunately, you can't catch a Red Gyardos is Pokemon diamond, but you can catch one in Pokemon Heart Gold or Soul Silver. It'll be at Lake of Rage.
You cannot catch one. You can only choose it as a starter Pokemon in Pokemon Red and Blue.
You cant
The old man is not a Pokemon