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I hope every final stage gets one. If not, at least they should give Pokémon like Chimecho one to make them useful.
I predict that only "natural" Pokémon can Mega Evolve. By natural I mean Pokémon that are at their last non-human influced stage; no evolution stone stages. So for example Growlithe could Mega Evolve but Arcanine can't. Since stone-evolved Pokémon are already pretty limited to their moves it woudn't be too Farfetch'd. This would also give the anime the perfect opportunity to give Pikachu a Mega Evolution as well.
