Earthquake

Earthquake is -type non-contact move that was introduced in Generation I.

Effect
In battle, the user sets off an earthquake that strikes every Pokémon around it. Smashes a tail, foot, or fist into the ground, causing an earthquake. It inflicts double damage on a Pokémon that is underground (i.e. using Dig).

Move that can make a combo

 * Gravity: All flying, levitating Pokémon can be attacked with ground type moves, in addition it cancels and negates the moves Bounce, Fly, Splash, Jump Kick, High Jump Kick, and Magnet Rise, making Earthquake attack all Pokémon, except the ones using Protect, Detect, Dive, and Shadow Force and the ones that have the ability Wonder Guard
 * You can make a double battle combo with 1 of your partner's Pokémon if they're a type weak to Ground moves. Let them use Protect, Magnet Rise, or anything protecting them from ground moves and then use Earthquake. It should hit the opponents Pokémon hard, and your partner will stay protected.