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The point of the Mega Evolutions this gen was to create "game balance" and to bring existing pokemon to the level of "legendary" pokemon. Having too many legendaries this gen, would defeat the purpose. Besides, I'm sure future events will unlock more hidden in the game data, and with the new Serial Code aspect of Mystery Gift we might even get more Mega Stones we didn't know about. Or, dare I say, even a DLC.
