Aw Hell, why not?
Grass- Sceptile (Leaf Blade FTW!)
Bug- Heracross (Megahorn FTW! [or Endure + Salac Berry + Reversal FTSweep!])
Water- Kingdra (Rain Dance + Swift Swim + Surf FTSweep!)
Fire- Arcanine (Besides Dragonite, Tyranitar, Metagross etc has the highest non-legendary stat total)
Electric- Jolteon (Electivire has its stats uselessly placed in Attack and Magnezone is quadruple-weak to ground)
Flying- Togekiss (Technically Dragonite or Salamance but... their wings are so small!!!)
Dark- Umbreon (Technically Tyranitar but we can't use the same one twice right?)(Also, this one is good for grinding though you would never suspect it)
Psychic- Espeion (Technically Metagross but...)
Ghost- Dusknoir (Toxic + Protect + Substitute FTSlowW!)
Dragon- Dragonite (Personal preference, Salamance and Garchomp have the same total stats)
Normal- Blissey (So F#@!ing annoying! If you catch me using this Pokemon please shoot me.)(Snorlax also)
Ground- Flygon (A personal favorite, its ground/dragon, has levitate, and looks like a bug pokemon with wings. It confuses the hell out of people)
@TheDrifter: If you wanna go that route, technically, it's Arceus > all/ I think he's the Pokemon god.
Okay, geek-out over. :P