The only type that is super effective against electric is ground.
If your planning on going up against electric users though, grass and dragon types are also recommended as they half electric damage taken.
But ground is the best as ground types nullify all electric moves directed at them.
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Ground-types are super effective against electric-type Pokémon.
Super effective on Electric---Ground Super effective on Flying---Ice, Rock, Electric If you mean super effective on an electric/flying type: rock and ice.
Rock, electric, ice, and psychic types are super effective against Crobat.
Rock, electric and ice are super effective against flying type pokemon.
Ground type is super effective against electric, fire and rock type Pokémon.