Aipom's best moveset in Pokémon GO is Scratch and Swift, with 8.31 damage per second, and it can deal 117.9 damage before Aipom faints. This is true when battling in neutral weather.
All Aipom movesets ranked
Here is a complete list of Aipom movesets in Pokémon GO, ranked by their DPS and TDO. You can change the weather and the opposing Pokémon.