Pikachu. And by association, Pichu and Raichu too.
How could you possibly dislike the series' mascot?
Anyway, for me it's Spiritomb and Sableye , but only because of the 4th Gen Wonder Guard exploit, having to resort to entry hazards and status effects to KO something is not my idea of fun. --- We shall always remember the departed... White FC: 0862-2660-4156 / 3DS FC: 2492-4470-1418
Stunfisk. Who thought that was a good idea? Also Muk, Kirlia (though I like all the others in that evolution tree), and Gulpin/Swalot. --- "Mega Man power is the strength to fight! Those without strength don't evolve!" --Atlas, Mega Man Model F
Me, I hate Mr. Mime. Ugliest little sprite I've ever seen, and the fact that it's closer to a human than anything else is kinda creepy. --- Jogurt attacks! Inflicts 1 point of damage on the Goblin. Goblin is defeated! Jogurt gains experience. ...it appears that Jogurt's level has increased to 1.