Levitate
Not hit by Ground attacks.
Pokémon with this ability
Gastly
Haunter
Koffing
Weezing
Misdreavus
Unown
Vibrava
Flygon
Lunatone
Solrock
Baltoy
Claydol
Duskull
Chimecho
Latias
Latios
As a hidden ability
No Pokémon has it as a hidden ability.
As of v0.75.0 · engine 22ba612f