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I would stick with Adamant due to Mega Mawile not having a change in base speed. Jolly would be a good Baton Pass sweeper when it comes to Swords Dance for another Pokemon. I don't know how to breed Mawile with an Ice Punch in XY, but I would recommend Iron Head, Swords Dance/Iron Defense, Fire Fang/Ice Punch, and Baton Pass. Also, increase the Atk, Spe, and spdef. I could be wrong in this set up so you have the right to correct me.