You can't, I know you want to catch a bagon at the beginning of the game but you can't, I'm sorry.
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You can find a bagon in meteor falls.Past the bg waterfall. For Eevee, you have to trade it from another game
yes you can catch a Manaphy on emerald. (if you have a game shark)
trade from ruby/Sapphire/emerald bagon is a newer Pokemon leaf green focuses on the original 150 or catch at lost cave but get alot of max repels it is a glitch but it to work always hack yer game to acsess hoen region dex stuff.
U have to either transfer it from a gba game, use action replay, or catch bagon on route 210 (north), evolve it into shelgon, and then evolve it into salemence
ruby, sapphire, emerald, fire red, leaf green