>>22243453simple.
a) Earthquake is not a STAB that can be spammed easily in doubles
b) Mega-Kangaskhan being a highly relevant threat
c) The ability to deal damage to Rotom-W, going from a hard counter into a check for this M-Swampert that can be knocked out
d) Ice coverage is superfluous when you already have 2+ ice beam users in a rain team
e) Helping Hand + Waterfall already wipes max Sp.A Thundurus before it can attack Politoed with thunderbolt
f) Trying to stay in with Mega-Swampert with Mega-Sceptile or Amoonguss among most notorious grass types is pointless since I have better things to deal with those 2 without setting up fast rain and leaving myself open.
Ice Punch only adds the ability to knock out dragons, with Garchomp being outclassed by Landorus-T (which surprise, gets rekt by waterfall still) and M-Salamence for which I posess two mons able to knock it out 1v1, so in the end ice punch is a bad coverage choice whereas superpower provides above all else a quick way to remove mega.kangaskhan from the field which is invaluable given how it's among the most popular megas of the meta
