Dragon, ground, or ice
Bug-type Pokemon are strong against Grass, Fighting, and Ground-type moves.
Grass type Pokemon are strong against Water, Ground and Rock.
almost everything
Dragon type moves are only strong against dragon type Pokemon.
Ice types are supereffective and so are dragon types. Yes, dragon types ARE EFFECTIVE against dragon types. In some dual-type dragon pokemon, like Garchomp for example, Ice is 4x effective to it and Dragon types, 2x
Zekrom is an Electric and Dragon type pokemon.
Fighting type and bug type are strong against dark type Pokémon.
Fighting type pokemon.
Bug-type Pokemon are strong against Grass, Fighting, and Ground-type moves.
Flying, Poison, Bug, Fire, and Ice type moves are strong against a Grass type Pokemon.
Ice and Dragon type itself is strong against Dragon.
Grass type Pokemon are strong against Water, Ground and Rock.
Ground is super-effective against electricGround type pokemon.
Rock, fire, and flying type are strong against the bug type.
Poison and Steel type moves are good against Fairy type Pokemon.
Zekrom
Fighting type.