Pikachu should also get a mention of Mega Kick / Mega Punch. This is a big defining advantage over Jolteon, in that Pikachu can both a) use its ATK to do decent damae and b) can get a powerful normal move without using up Body Slam. Mega Punch and Mega Kick come before Cerulean City, and there are very few other Pokemon that want them (Charmeleon and Wartortle being the only ones really... the Nidos get Thrash / Body Slam around the same time). Since there are 2 attacks, you can give one to Pikachu and one to your starter.
edit: Also, I do agree with Seel being top, and:
I know that you all seem to hate on Gyarados's babying needs, but seriously... it seeing the same tier as Pikachu and Ninetales seems kind of dumb.
"Hmmm... a name for this plan..."