We've always had a soft spot for Gengar, a Ghost and Poison type Pokemon that appeared way back in Red and Blue for the Game Boy. Although it has one of the most powerful special attacks and sits in the top 30 speediest critters, it also has low health and defenses. Naturally, you have to make due with the good and bad.
Just because Gengar is on the weaker side, however, doesn't mean it's a pushover. Far from it. In fact, this video explains exactly how to turn your Gengar into an all-powerful critter that other trainers will fear in Nintendo's Pokemon X and Pokemon Y.