I have a lot of favorites. Chandelure, Zoroark, Golurk, Ferrothorn, Rampardos, Magnezone, Electivire, Giratina, Gardevoir, Roserade, Latias, Rayquaza, Feraligator, Raikou, Ho-oh, Venusaur, Butterfree, Nidoking, Ninetales, Arcanine, Haunter, Snorlax, Gyarados... and probably some others.
My least favorites are the ones that turn bright green or pink. Blue Pokemon especially have that problem, like Heracross, Swampert, etc.
THAT'S MISS FUNERAL CAKE TO YOU do you wanna die or just come real close?