>>32294838Hippowdon is C+ in the current OU viability rankings. It avoids the 2hko from Ice Punch and 2hkos back with earthquake.
0 Atk Hippowdon Earthquake vs. 0 HP / 4 Def Metagross-Mega: 168-198 (55.8 - 65.7%) -- guaranteed 2HKO
252 Atk Tough Claws Metagross-Mega Ice Punch vs. 252 HP / 80+ Def Hippowdon: 170-202 (40.4 - 48%) -- guaranteed 3HKO after Leftovers recovery
Still, Mega Metagross can run grass knot