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I'm convinced that someone added those Dex entries after watching the anime and thinking that it would be cool...Because the "consequences" of Mega Evolving never came up in the actual Gen 6 games at all.
It's also not consistent with Pokemon's other media. Everyone talks about Korrina's Lucario in the TV show, but she was one character out of dozens. In something like Pokken, Masters, or Pokemon Adventures, Megas are as tame as their regular forms. Exactly like the core games.
