>>16606803I've basically only heard of bulk up sets for X2 since
>drain punch
outside of the usual mixed sets. But since ubers is a pretty special meta, CM might not be bad, but obviously you'll not be making use of that base 190 attack. The main thing is that the biggest moves that X2 is now neutral to are physical, like Sucker Punch and U-turn, which CM doesn't help with.
I wouldn't be entirely surprised if Deoxys and Mewtwos started running Shadow Ball instead of Dark Pulse anyway because of X2, since the only Normals in Ubers are normal Arceus
and probably Mega Mom, even if she's not banished to ubers entirely. and it will let them hit Xerneas and Scizor switchins harder and safer. So I don't see X2 and CM together having a lot of specialized defense like Blissey or Avalugg, but rather a bit more balanced.