lol, envy Blissey's offenses, do you even know how walling works? You know, if a Pokemon has a massively huge special attack of 85 with NO boosting moves, it's best used as an attacker!
Offensive Blissey, because when I think Blissey, I give it moves like Earthquake, Rock Slide, Wild Charge and Present. Why not? Did ya see dat that 10 physical attack? With STAB present I have a 10% chance to bust out 120 base damage! Oh and 20% chance to heal my opponent 50% health.
I did some calcs and it takes 10 hits to kill Sunkern with Rock Slide, yay! Get this, only 2 hits to kill Pichu with Earthquake! Poor Pichu's 20/15/30 defenses it never stood a chance.
With that 75 special attack, it's obviously a special attacker, silly me, give it specs and teach it Ice Beam, Thunderbolt, Shadowball and Hyper Beam.