As of 2015, the top liked pokémon is (you wouldn't believe): Charizard!
With Lugia in the 5th place, Gyarados in the 12th spot, and Umbreon in the 18th.
Annnd the most hated pokémon is....... Luvdisc...yup! With Vanillite in 5th place and Smoochum in the 6th spot.