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If you found a lvl 100 lucario in the wild or got it from someone via trade im 99.9% sure its hacked but the .1% chance that maybe its glitched is possible but theyve gotten smarter since r/b/y and i doubt things like that happen anymore at least not often. Anyway no you cant find one in the wild lvl 100 only the riolu egg obtained from riley(looks like wave hero) and then evolve via happiness+Day time+Lvl up