Choose Squirtle as your starter. Beat the elite four. It will become wild. Then you have to search for it.
You have to choose bulbasaur as your starter
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No, you can catch Entei without catching Moltres.
you can find them in Pokemon leaf green /fire red after you beat the elite 4 and the champion Charmander - Suicune Squirtle - Raikou Bulbasaur - Entei how do you find them?
Zapdos, Articuno, Moltres, Mewtwo, Entei/Raikou/Suicune (depends on what starter you chose).
on rainbow island 17 talk to the proffeser he will give you a choice of entei,raikou or suicune
Entei because it learns eruption and fire blast! Hope that heps!