My Chimecho knows the moves:
Last Resort (im planning to replace psychic with this)
My Drifblim knows:
Fly (i needed a flying Pokemon)
Honestly, Chimecho is a better Pokemon in this scenario to get Psychic, as you do get STAB. Also, Drifblim has no use for Psychic - Poison and Fighting, the two type Psychic hits, are resisted by Drifblim, and won't be able to do much to it anyways.