>>50945986rule 2 of megachomp
nobody expects a mixed/special megachomp
rule 1 is never use megachomp for anything but memesyes 170 attack with chance of swords is cool, but it's just a ruse. 120 special attack against something that is not expected to take special hits hurts like a motherfucker, and garchomp's got a small but concise and very much functional special learnset.
and then they switch in their special wall and you unleash all of your 170 attack on it, which hurts like a motherfucker even uninvested.