The only type it is weak to is Ground Type,and rock type.
ground
Natu is a Psychic and Flying type Pokemon it is weak against Electric types, Rock types, Ghost types and Dark types.
Cynthia's Pokemon and their weaknesses: Milotic is weak against electric Lucario is weak against fire type moves and earthquake Garchomp is weak against dragon-type moves Spiritomb is weak against water Sorry, I forgot the rest. I hope this helps a lot!
If you mean Electric-types weaknesses, they are only weak against Ground-types.
Grass or electric type moves
If I understand your question correctly, Dark, Psychic, and Grass are weak against Bug.
Water-type Pokemon are weak against Electric and Grass-type moves.
Electric-type Pokemon are only weak against Ground-type attacks.
Water Pokemon are weak against Electric and Grass type moves.
Pidgeotto is weak against electric type Pokemon like pikachu.
The only thing that is super-effective on electric type Pokemon is ground. However grass and dragon types are both good choices to battle against an electric type as electric moves aren't very effective against them. Electric-type Pokemon are weak against Ground-type moves.
Water-type Pokemon are weak against Electric and Grass-type attacks.
Water-type Pokemon are weak against Grass and Electric-type moves.
Squirtle is a water type pokemon, it is weak against grass and electric type pokemon.
rock or ground
Electric, Fire, Poison, Rock, Steel
Electric is weak against Ground-type attacks. (Super effective to Electric-type Pokemon) Electric, Steel, and Flying-types are not effective very well against Electric.
Water/Ice type pokemon are weak against rock, electric, fighting, and grass type moves