PokéBase - Pokémon Q&A
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Nothing is preventing you from having multiple Pokemon that can mega evolve. However, you can only mega evolve one Pokemon per battle, so any other Pokemon holding a mega stone is left with a useless item. This is why it's generally not recommended (but still perfectly legal) to have multiple mega stones on one team when you're participating in harder battles, like the Battle Tree or Battle Spot.

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not suggested, but totally allowed.