Mankey doesn't learn this technique naturally, but you can teach him TM01 (Mega punch) at any level.
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Hitmonchan learns Mega Punch at Level 41.
no
Snorlax is a good candidate.
Mega Kick does 40 more damage (120), but only has 5PP and 10 less accuracy points. Mega Punch has 80 damage, and 85 accuracy, and TWENTY PP. Clearly, Mega Punch is the better choice, unless you want a Pokemon with KO power instead of endurance in battles.
Gloom learns Mega Drain at level 23.