Eevite will not devolve your Eeveelutions, so keep it Eevee if you want to mega. You can breed Eevee or get more at the Game Corner, and the other starters and their stones can be found post-game. IIRC, there are no other similar choices in the game, you should be able to obtain every mon on 1 file without trading. Some legends you have to make a choice between, but you’ll be able to catch the other later. ex: Heatran and Volcanion
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