Weavile @ Choice Band
Ability: Pressure
Tera Type: Dark
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Knock Off
- Ice Shard
- Triple Axel
- Pursuit
I find the standard Banded Weavile to be the best match for Iron Moth, as they compliment each other quite well offensively and both being very speedy threats that could grab the KO on some important mons that normally threaten Iron Moth.
252 Atk Choice Band Weavile Triple Axel (120 BP) (3 hits) vs. 0 HP / 0 Def Ogerpon-Wellspring: 322-381 (106.9 - 126.5%) -- guaranteed OHKO
252 Atk Choice Band Weavile Knock Off vs. 0 HP / 0 Def Iron Crown: 302-356 (94 - 110.9%) -- 62.5% chance to OHKO
252 Atk Choice Band Weavile Triple Axel (120 BP) (3 hits) vs. 0 HP / 0 Def Great Tusk: 442-526 (119.1 - 141.7%) -- guaranteed OHKO
It's also a good switchin to Iron Crown, and threatens it with Pursuit if it threatens to switch out. Also, if Iron Moth decides to Tera (most likely into Ground), its Ice coverage is very helpful against the various flying-types of the tier (lando-t, gliscor and the like)