It would be riaku or zaptos.
The most powerful water type is Suicune.
Electric-type Pokemon are only weak against Ground-type attacks.
Psystrike
The most powerful rock type move is either rock wrecker and head smash
Ground type Pokemon can beat Electric type Pokemon easily.
Rayquaza
Electric Pokemon have a very powerful and crippling weakness to the Ground type. Ground type moves are super effective against most Electric type Pokemon. In addition Ground type Pokemon are also immune to Electric type moves.
The most powerful water type is Suicune.
Electric-type Pokemon are only weak against Ground-type attacks.
Kyogre.
electric type of course!
Rhydon
Elekid is an Electric type pokemon.
Psystrike
Most electric type and psychic type pokemon can learn flash.
The most powerful rock type move is either rock wrecker and head smash
Most electric type Pokemon can learn flash.