[Go10]

Originally Posted by Fat Poppy

Don't kid yourself about 101 HP Substitutes lol, anything that uses them will be unbreakable by Blissey's Ice Beam, Thunderbolt, or Flamethrowers; SubCM Arceus, SubBU Dialga, Substitute Excadrill (rain, and it can still spin on you or obliterate with +2 Earthquake), SubDtail Lugia (Ice Beam and Tbolt don't break subs), Ho-Oh, I could go on. Moreover, there is a high opportunity cost for using two attacks with Blissey, as it has access to very poorly distributed moves such as Wish and Aromatherapy, which cannot be fitted with any other attack move other than Seismic Toss (Flamethrower as a sole move is ok on a sun team, but stil...).

Chansey has significantly more special bulk than Blissey, and according to superimps super helpful thread - A Defense Tier to Reach the Stars it has a roughly ~ 22.2% advantage in the special defense department; that is huge.

Chansey is capable of taking significantly more powerful special attacks than Blissey, including a whole host of physical ones, having roughly the same physical bulk as specially defensive Ferrothorn. Chansey can wall support Groudon, Blissey can't.