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I'm going to be unoriginal and pick Gyarados, because I have used Gyarados so many times in various games and I've always found it to be a satisfying addition to my team, even if it takes three lifetimes to level.
Serperior takes the win for me! It's elegant and regal, certainly one of the best Pokémon to come out of the 5th generation. I do love Arbok as well, though.