Crabominable

Crabominable is the ultimate abomination of bad moves and typings thrown together. Like, WHAT IS THIS THING GOOD FOR?? Nothing makes sense for Crabominable's profile in Pokemon Go, and the fact that it requires a Glacial Lure for even its Dex entry is criminal. 

Best PvE Offensive Moveset

• Rock Smash is more meaningful for Crabominable's role, but it's not a very good move overall.
• Bubble is better for actual Water-type Pokemon.
• Crabhammer synergizes with Bubble, but perhaps consider actual Water-type attackers instead. 
• Power-Up Punch is terrible for attacking, and is meant only for PvP.
• Brick Break is just as bad.
• Ice Punch gets STAB but lacks synergy with Crabominable's Fast Moves.
• Payback has no use. 

Best PvE Defensive Moveset

• Rock Smash has a higher base power on defense and benefits from STAB, making it better vs neutral attackers.
• Bubble is less likely to be resisted among Crabominable's lengthy list of weaknesses.
• Ice Punch can be spammed frequently as a 3-bar move on defense, and hits harder with STAB. 
• Power-Up Punch performs similarly as a 3-bar STAB move, but has a slower animation and lacks coverage.
• Brick Break is weaker, but harder to dodge.
• Crabhammer is a decent alterative for defensive purposes. 
• Payback takes too long to access for defense; Crabominable will likely faint before it can use it. 

Bubble offers above average energy generation, though its damage output is less impressive without STAB. Rock Smash is a poor move for PvP, even with STAB. 

Crabominable awkwardly doesn't hit as hard with Crabhammer as other crustacean Pokemon do, due to the lack of STAB, however its moderate energy cost makes it a decent choice. Ice Punch benefits from STAB and can be used often to provide useful coverage. Payback helps to cover Crabominable's weakness to Psychic-type Pokemon, as well as its largely neutral damage against many Pokemon.

Power-Up Punch is only useful to ramp up damage for Rock Smash (since damage from Bubble is somewhat poor), but this is a very inflexible strategy that does not generate enough energy for coverage options.