Staryu's best moveset in Pokémon GO is Water Gun and Bubble Beam, with 8.53 damage per second, and it can deal 88.0 damage before Staryu faints. This is true when battling in neutral weather.
All Staryu movesets ranked
Here is a complete list of Staryu movesets in Pokémon GO, ranked by their DPS and TDO. You can change the weather and the opposing Pokémon.
|1.||Water Gun||Bubble Beam||8.53||88.0||15.3|
|2.||Water Gun||Power Gem||8.21||84.6||14.7|