You catch it in the Victory Road, but it is super quadriple rare!
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it depnds were u evolve it
Level up an Eevee with full happiness at nighttime (after 6pm)
Trade it to ruby,sapphire or emerald have them evolve your evee at night then give it back to leafgreen.
You can find a bagon in meteor falls.Past the bg waterfall. For Eevee, you have to trade it from another game
To get vaporion give evee a water stone.to get flerion give evee a fire stone. to get joltion give evee a thunther stone and that is all for Pokemon leaf fire and and water