Will my new shiny Mew affect my game?

Hi, yesterday I got a shiny Mew in a trade.I was so happy because Mew is my favorite Pokemon, but then when I thought about it, I thought it could be hacked.I have searched all over the internet and a lot of people say that they had their games deleted due to hacked Pokemon or bad eggs.So here are the details:English name: MewLevel 100Caught in PokeballNature: TimidAbility: SynchronizeHP- 341Attack - 212Defense - 236Sp. Atk - 299Sp. Def - 237Speed - 328.ID number - 33916OT - sayletaOnly ribbon (which I got myself) is the Kalos Hall of Fame ribbon.Came from Hoenn, says he had a fateful encounter in Hoenn. I gave it Leftovers and I taught it all legit moves - Psychic, Aura Sphere, Dragon Claw and Shadow Ball. Before that, it knew Psyshock, Sludge Bomb, Aura Sphere, and I forget the other one.

Please tell me if it is legit, and if he is not, is he safe to use, or will he corrupt my game file? I don’t want over 150 hours to go to waste.

Please reply quick, thank you.

Pleaselog inorregisterto add a comment.

Well I know some factors that tell if it’s hacked:

IVs are something you have to look at. For the most part, it shouldn’t corrupt your game, if it was pokegenned, those Pokemon are relatively safe and since it is the more common hacksource(other than powersave), it’ll keep your game ok.

But if was hacked in some sort of harmful way, it could hurt your DS. I’ve used some hack Pokemon to breed legit stuff, and I never got a bad egg, probably beacuse of the 3DS’s better programming, so for the most part, I don’t think you have anything to worry about.