Definately a unique Pokemon, Snorlax d is I think the first Pokemon with both a Poke-Power and Poke-Body, but no "attacks". 80 HP is good for a Basic, has a Fighting Weakness, and the usual high retreat cost for a Snorlax. Snorlax relies obviously on its Power and Body, wheras the Power removes 2 damage counters and puts him to sleep, and the Body (if Snorlax is still asleep) lets you put 2 damage counters on the Defending. It's nice as it is essentially a "free" card in that you don't have to attach Energies onto it (unless you really want to retreat him) and he makes an effective wall for a few turns, but Snorlax is ineffective in the long run and becomes a burden later in the game.
Modified - 3/10 (Fun to use, but will not get you anywhere later on)
Limited - 8/10 (Effective here as a big Basic, and lets you power up your bench)
Unlimited - 1/10 (Base Gastly is better)