Rating by request.
Hi STEELDRAGON, sorry it took me so long to rate this; I was on vacation for the last week and a half. First of all, nice avatar xD! Now onto the rate! As my close friends will tell you, I personally LOVE choice teams. My first truly successful team in DP was an all-choice team, and it kicked ass. However, over the course of the metagame shifts, all-choice teams have lost their potential, IMO. There are too many stall teams that can stop these sorts of teams, and therefore it really is hard to compete at higher levels of play. With that in mind, I hope you don't mind me suggesting some changes that require you to not use a choice item on two Pokemon.
You obviously have offensive teams checked pretty easily with a team like this, but like I mentioned, stall is a huge problem. To help solve this problem, I would like to suggest you change Choice Specs on your Heatran lead to Life Orb. I think you'll find that it does a lot better as a lead, not leaving you locked into Stealth Rock, or a -2 Overheat. You can freely switch from Overheat to Explosion on things like Blissey, which should help allow Kingdra to do more damage. I would also like to recommend you change Earth Power to Hidden Power Grass on the Heatran set, because Earth Power is primarily used on other Heatran, who unfortunately outspeed you when you're using a Modest nature. The next change I would like to suggest is a combination change. I think changing your Flygon to a Mixed Flygon will utterly destroy any stall team in your way, and still lay down the hurt against offensive teams, allowing you to throw out Draco Meteors in combination with Kingdra. The specific set I'm suggesting is:
Flygon @ Life Orb
Rash / Naive, 80 Atk / 252 SpA / 176 Spe
With this change, you lose a revenge killer, so I would like to suggest changing your Specs Rotom-A to a Scarf Rotom-A. You should use the same moveset and EV spread, but with Hidden Power [Ice] over Hydro Pump, so you can revenge kill Dragon Dance Dragonite. With these changes, you leave yourself open to Dragon Dance Tyranitar, though, so I think you should put Iron Head on your Scarf Jirachi over U-turn. U-turn might be good for scouting, but I find that on all-choice teams, hitting hard is far superior to scouting through U-turn. After all, you only have one entry hazard, and against a Spikes stacking team, you're doing more harm than good by using U-turn. I hope you found this rate useful, and I wish you continued success with your team!
# of times I've beaten the E4: 173
# of level 100 Pokes: 9 (NO HACKS!!!)