Nice name, deserves a rate...
I like it, apart from the item - change for a mira berry, as paralysis and/or confusion can really hinder its smashing. Otherwise, great, and definitely AP over 'slide.
Nice - this is who deserves lefties. A good tanker, double stab, see no problems here.
HP dark IMO isn't too hot, it is only s.e vs ghost/psychic, and both its attacks will do null vs a dark. If you have to have an HP, have something unexpected but more to the point, useful, say, electric/grass hp.
Will this work with so many stat-lowerers out there? I don't think so. You need a roarer, change curse for roar, and lose rock slide for iron tail - 75 base damage vs 150, your choice, and both are innacurate. As for leftovers, lets see an item clause here, change for pink bow to make explosion as pwoerful as possible - remember his attack is still low compared to many other attackers.
Tyran AND drago? There really should be a ban on having both...oh well, dragonbreath won't sweep to well, and you are wasting his attack (you criminal). Change d.breath for wing attack and attach the sharp beak. Flying is s.e vs more things than dragon.
As a heal beller? Well, I doubt even leftoversa nd softboiled with keep it alive - it will take mondo damage when it switches in to heal bell, another if you want to keep it for the next round as its slow. This poke seems very redundant. You have good special attacks in the form of all the other pokes bar steelix. You LACK a fighter - get in one of the hitmons.
Overall, a pretty sound team, yet I see no use for blissey. The idea of tyran starting is good - smash the first few pokes, and when he falls, it will be easier for the rest of the team. Good!!
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A legendary is only legendary if it has a legendary set.