Quilava's best moveset in Pokémon GO is Tackle and Flamethrower, with 10.04 damage per second, and it can deal 163.0 damage before Quilava faints. This is true when battling in neutral weather.
All Quilava movesets ranked
Here is a complete list of Quilava movesets in Pokémon GO, ranked by their DPS and TDO. You can change the weather and the opposing Pokémon.