Ground types.
Electric moves are effective against ground pokemon but will do little damage... Water pokemon will have the most effect!
Most of the normal pokemons.
ONLY ground types. however, some ground type pokemon, ( like cubone or marowak ) have the ability "lightningrod" witch prevents electric type moves for effecting them. electric types don,t effect ground types anyway.
Well If your asking what it does on Pokemon platinum It makes the foes pokemons hp go down to 1... most of the time.
Most electric types, some normal types and grass types.
Its the ancient mew holofoil promo card u could get it at pokecorner.com
That is really a question that no one can answer, but the most important thing is to have many different types of pokemons in your party. The most important ones are : Fire, Water, Electric, Psychic, Rock/Ground, Flying. My own team is: (Fire) Arcanine, (Water) Gyarados, (Electric) Jolteon, (Psychic) Espeon or Kadabra, (Flying,Rock) Aerodactyl, (Ghost) Haunter I don't like playing with the legendary pokemons, too easy ^^ Good Luck!
Rayquaza
Electric-type Pokemon are only weak against Ground-type attacks.
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.
Most electric type Pokemon can learn flash.
electric type of course!