Quoted By:
>252 Atk Tough Claws Charizard-Mega-X Thunder Punch vs. 0 HP / 4 Def Charizard-Mega-Y: 262-310 (88.2 - 104.3%) -- 25% chance to OHKO
>252 SpA Charizard-Mega-Y Ancient Power vs. 0 HP / 0 SpD Charizard-Mega-X: 176-208 (59.2 - 70%) -- guaranteed 2HKO
>252 SpA Charizard-Mega-Y Air Slash vs. 0 HP / 0 SpD Charizard-Mega-X: 163-193 (54.8 - 64.9%) -- guaranteed 2HKO
X can take a hit, dragon dance and KO or just KO straight up if he's lucky.