no, he's not a flying type. Thanks to his ability levitate he is flying and are ground type moves not effective.
Thunder Electric type moves
Electric type
Grass and Electric moves
Electric-types are weak against only Ground-type moves.
Electric type moves are extremely effective against Gyrados, rock type moves are super effective as well.
Ice moves, Water moves, Electric moves, Rock moves.
Thunder Electric type moves
Electric type
Ground types
earth, fire, and grass are all super affective to quagsire in Pokemon soul silver
FIRE ELECTRIC PSYCHIC
it makes it so that only super affective moves hit
Dragon-type moves are super effective against Dragon-type Pokemon.
Ground type is the only type effective to electric type.
Grass and Electric moves
Grass, electric and some other i don't know them all
Ice, Rock, and Electric are super affective against flying type