In terms of fighting prowess, Sceptile has to be given the upper hand. He just owned in a lot of Gym Battles and Frontier Facilities, put up an awesome fight against Regirock and defeated Darkrai (Though Gible had already done most of the work on that one) Fully evolved, killer moveset, can't really ask for more.
Right after that I would put Torterra, though mostly for its wins as a Turtwig and a Grotle where is really shone and showed a lot of strength. Lots of good battles against tough opponents. Still, a win after it has fully evolved stops him from joining the truly great.
After that, I would kinda say Bayleef. Some good wins as a Chikorita, evolved, got a gym win and defeated a fully evolved fire pokémon at the Silver Conference.
After that, I would put Snivy. Great moveset, killer personality, some good wins (Servine, Pawniard, most probably Palpitoad) and really puts up a great fights against a variety of opponents. Unique attacks
After that I would put Bulbasaur... honestly, for all the time it was on the show, it has a pedestrian battling record to show for it. A Scyther at the Indigo Plateau, an Eggecutor in the OI, Vincent's Meganium and Brandon's Solrock is all it has to show for it.
Last is Swadloon.
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