Mega Diancie's best moveset in Pokémon GO is Rock Throw and Rock Slide, with 20.48 damage per second, and it can deal 540.2 damage before Mega Diancie faints. This is true when battling in neutral weather.
All Mega Diancie movesets ranked
Here is a complete list of Mega Diancie movesets in Pokémon GO, ranked by their DPS and TDO. You can change the weather and the opposing Pokémon.
|1.||Rock Throw||Rock Slide||20.48||540.2||46.4|
|2.||Rock Throw||Power Gem||20.00||527.5||45.3|