Is this person a hacker?

Question

So, I decided to have a Wifi battle, and this person Mega-Evolved ALL of their Pokémon. Their name seemed Japanese-like, so is it only a thing in Japan? Or are they hacking? Also, their team was made of shiny legendaries.

Comments

How the heck do you Mega Evolve Legendaries other than Rayquaza, Groudon, and Kyogre? The last two aren't even Megas, technically, they're Primal Reversions, and I believe there's no limit to the amount of Primal Reversions you can have.

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shiny legendaries... aren't there only M-latios, M-Latias, and M-Rayquaza for legendaries? not counting P-Groudon and P-Kyogre

Answer 1

Yes. Obviously they are a hacker if they can Mega Evolve more than one Pokemon.