But Bulbasaur is grass / poison type. Electric is not very effective against grass, so Bulbasaur will have an advantage unless Pikachu avoids using its electric attacks.

IIRC, neither one has an advantage or disadvantage against the other. It'd actually be an even match!

Edit: According to http://pokemondb.net/type , when Grass is attacking Electric, the attack is "normal," 100% of the damage takes. However, when Electric is attacking Grass, the attack is "not very effective," and only 50% of the damage takes.

So Bulbasaur is totally going to win this.

May have meant squirtle

Bulbasaur is a grass type Pokemon!

Electric > Water

Earth & Rock > Electric

Bulbasour its Grass though :p Electric is not very effective against Grass. /endOfPokemonNerdComment

A level 100 Raichu can kill a level 5 Bulbasaur using one Body Slam.

I wonder what Wolfram has to say about this...