Anyway, I am going to try and fix your issue with Deoxys-S, Husky wusky. I also noticed the fact that a Jolly Swords Dance Lucario with Swords Dance, Close Combat, Stone Edge and Bullet Punch can OHKO every member on your team with Stealth Rock down (besides Deoxys-S, who takes 68-81% damage from Bullet Punch); also, the standard SubCM Jirachi seems to rip this team another one, as Thunderbolt will take care of Aerodactyl / Gyarados, Gengar and Deoxys-S will barely be able to break the subs, Lucario is always beaten by standard ones since standard runs 308 (at least it should), and Garchomp is outsped at 308.
First, how necessary is Life Orb on Deoxys-S? Generally speaking (and this is very general lol), you're going to be using a SE attack, and when you don't, it is because your opponent has predicted the move and hoped to take 10% life from you, right? By using Expert Belt you might lose power in situations like Thunderbolt on Jirachi / Bronzong switching in or Swampert switching in on an Ice Beam, but I feel those are wasted turns anyway since the 25% or so you are going to do (Leftovers) is actually less of a hindrance than the 10% they took from you, and likely 16.25% due to Sandstorm.
If you run Expert Belt you won't really suffer in any conceivable SE attack that I can think of, you won't waste precious Deoxys-S HP by using a worthless attack, and at worst you will have a 50 / 50 check against other Deoxys-S. Run Expert Belt unless Life Orb is giving you some mysterious damage potential that I cannot see right now.
I also recommend you run a spread of 4 HP / 72 Def / 180 SpA / 252 Spe, for 242 HP / 234 Def / 271 SpA / 504 Spe. This 234 Def allows you to never be OHKOed by a Life Orb Jolly Lucario Bullet Punch after One Swords Dance and assuming you have switched Deoxys-S twice into Stealth Rock or into Stealth Rock + Spikes (essentially, it always does less than 75%). Just as auspiciously, that same Lucario's Extremespeed never OHKOes (without the entry hazards this time though), and the Adamant version's Extremespeed does not OHKO on average. Just gives you a handy little "check" against this monster. Also, I emphasize Jolly because Garchomp deals with Adamant Lucario fine.
Essentially, I am asking you to lose damaging potential by switching Life Orb for Expert Belt and losing 18 SpA points for some Defense and HP, in order to better deal with Deoxys-S and Lucario. I really can't imagine a scenario where the damage drop is a significant issue, but I can definitely see how Deoxys-S and Jolly Lucario are issues. Run Expert Belt and use 4 HP / 72 Def / 180 SpA / 252 Spe for the EV spread.
Second, I would recommend making Garchomp Jolly. I know...it pains me even to suggest this. I absolutely ADORE Adamant CB Chomp; the 10% increase in damage is actually that awesome. However...for your specific team, I must request you switch it to Jolly. This would immediately help you with Lucario and Jirachi, and would give a 50 / 50 against Yache Chomp variants, which I am sure occasionally irritate you. I know you lose the high probability of a 2HKO with Outrage on Hippo / Cress, and I know you lose the 2HKO with Outrage on Magnezone (can't tell you how many times it has saved me), but it seems to me that your team is dynamically built to have those Pokemon at sub 90% health mid-battle anyway. Make Garchomp Jolly.
Third...now, I know firsthand how awesome Gengar's ability to switch into the battle is...and I use Gengar not only for its offensive potential but also its defensive potential as well (that's why I never got the Darkrai > Gengar thing I mean Gengar is wayyyy easier to switch in). However...I have to say this is your major weak link. A Gengar leaves you vulnerable to Deoxys-S, other Gengar, and + 308 Speed Steels like SubCM Jirachi and Scarf Heatran / Metagross (especially Metagross with ThunderPunch / Ice Punch). I don't think the Fighting / Normal / Ground immunities, and the Bug / Grass resists are THAT paramount since without Gengar you have one more resist than weakness for all 5. Since playing a heavily offensive team like this requires well managed playing anyway, I think you can accept the +1 bit.
So at this juncture I'm still looking at what Deoxys-S / Gengar / Azelf / ScarfMetagross can do to you, and I'm starting to worry about Raikou's effect on the team. CB Dugtrio also gives you issues, especially with Sucker Punch, and you know your own Celebi issues, which Gengar doesn't necessarily solve if the Celebi is a Calm Mind Psychic variant. I'm pretty convinced that replacing Gengar with something that helps you deal with all of those is almost a total win-win situation, as the benefits Gengar brings to you are almost excessive, besides maybe Hypnosis and the occasional utility of Explosion. Something that can deal with all of them + let you keep the utility of Explosion?
ScarfHeatran, Naive and at 252 Speed. This will allow you to deal with all the aforementioned problems while seriously helping you against those + 308 Speed Steels. I know that it causes your +2 Fighting / Ground to even out at neutral efficiency, but I'm confident in your ability to play around it, and I think that dealing with the Raikou / Deoxys-S / Gengar / Azelf / Metagross issues is far more important than dealing with Fighting / Ground issues.
Fire Blast will always OHKO Gengar / Azelf with Stealth Rock and deal with Lucario / Metagross / Jirachi / Celebi; Earth Power will help deal with Raikou; Explosion will be there for its general utility (and at 216 Attack, more powerful than the 158 Attack Life Orb Gengar Explosion). The fourth move can be whatever you want, though I would recommend either HP Electric (as Gyarados will switch into you, and you will be forced to switch out and then back in, and if by chance what you switched out loses, Heatran is still faster than almost all the standard variants of Gyarados) or HP Ice (obvious reasons). I would recommend HP Electric since I would rather Explode on a 100% Garchomp late game.
In other words, I feel that replacing your Life Orb Gengar for a Choice Scarf Heatran will significantly help you in your main issues, and the negative effects of losing Gengar are not that significant. Replace Gengar with Heatran.
That's pretty all I can say for your team. I have a thing for cool leads, so I spent some extra time dissecting your team :P
Hope this helps you!