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My top favorite is Litwick. Yes, the cute little candle that actually sucks the life out of others. Not Lampent or Chandelure (although don't get me wrong I love those two as well), but Litwick.
I actually like the majority of the Unova Pokemon. But after Litwick I suppose my other top five would be Snivy, Joltik, Lilligant, Keldeo, and Victini.