Grumpig's best moveset in Pokémon GO is Extrasensory and Psychic, with 11.59 damage per second, and it can deal 334.6 damage before Grumpig faints. This is true when battling in neutral weather.
All Grumpig movesets ranked
Here is a complete list of Grumpig movesets in Pokémon GO, ranked by their DPS and TDO. You can change the weather and the opposing Pokémon.
|4.||Charge Beam||Shadow Ball||9.80||283.1||22.7|
|6.||Charge Beam||Mirror Coat||8.22||237.3||19.0|