I decided to revamp my team majorly from the last few critiques I have received and I have found this team to be quite good.
Cloyster @ Focus Sash
Adamant Nature (252 ATT/Speed EVs)
Ability: Skill Link
A generic Cloyster, to unprepared teams/dragon teams this guy is incredibly deadly. The only way he is ever taken out after he's shell smashed is priority moves or against pokemon that are strong against rock/ice. The sash is obviously to protect him until he has successfully shell smashed. Ice Shard is mostly for a revenge-attack when I know Cloyster is going to die and win speed battles. Against dragons like Salamence/Garchomp, it makes a very good revenge attack before he dies.
Thundurus @ Life Orb
Timid Nature (252 SP. ATT/Speed EVs)
Thundurus is scary fast, like fast to the point where he out-speeds everything practically. I like Thunder because in Drizzle its accuracy is raised to 100% while its a 120 based move with STAB. Focus Blast is for the annoying Ferrothorn or Tyranitar that tries to get in my way while HP ice is for dragons and other types that threaten him. Nasty Plot is useful because Prankster gives it priority so if they're using a switch-out, I tend to use it to get majorly beefed up.
Politoed @ Chesto Berry
Calm Nature (252 HP/SP. DEF EVs)
Politoed, one of my favorites, he is here initially to cast Drizzle and fix the playing field in my favor. You'll notice that despite Thundurus, I really don't need drizzle that much, that's supposed to be the reason. The team's designed to be better with drizzle but not depend on it in the case of a loss in the ever-lasting weather-battle. Hydro Pump is a great move in the rain with STAB while Rest with the Chesto is a great way to heal in case of a hard hit but at the same time, people often try to Spore Toed to sleep so that is another case where the berry finds its usefulness. Toxic/Substitute is merely to stall out tough walls or to hurt pokemon I know will take time dealing with.
Jirachi@ Air Balloon/(Berry that cures Paralysis)/Life Orb/Choice Scarf
Adamant/Jolly/Calm/Sassy nature? (currently 252 ATT/Speed EVs)
Ability: Serene Grace
-Fire Punch/Body Slam?
I absolutely love Jirachi from the moment I saw the movie to this generation where he's easily on an uber level even if Smogon does not recognize it. Despite it being my favorite, it is my most confusing. I love Iron Head for the 60% flinch while the punches offer great type coverage and can hurt almost all types in at least one way. I am stuck on Body Slam because the 3 times Jirachi has died, it has been because it was paralyzed and then out-sped and killed. I have CONSIDERED Body Slam for the purpose of paralyzing fast opponents while Fire Punch (sometimes before, sometimes after) drizzle offers great coverage for fire-weak (Ferrothorn, Scizor, etc) pokemon. The items confuse me because in Drizzle, with an Air Balloon, Jirachi's weaknesses are neutralized while the threat of paralysis lingers. While a berry to cure paralysis would be useful, then Jirachi is weak to Earthquake which is common. Life Orb I've never used but the increased attack seemed useful. Choice Scarf is mostly for spamming Iron Head and out-speeding everything and trying to win through continuous flinching.
Conkeldurr @ Flame Orb
Relaxed Nature (252 HP/Attack EVs)
I enjoy Conkeldurr because I underestimated his value while he has proved to be one of the best fighting walls I have seen. His excessive fighting provides great coverage to Tyranitar and others dragons (Hydreigon, etc), while Earthquake is there for type coverage. In Triple battles/Double battles I place him next to Latios so his Earthquake only harms my opponents. Bulk Up is to get stronger obviously, which I do if my opponent is wasting their time on my other pokemon. Mach Punch is to revenge-attack Hydreigon/Tyranitar, etc before he dies and to win speed-battles when one hit decides it. The flame orb is to take advantage of Guts which makes him deadly. He can currently survive 2 psychic/flying moves while the second move kills him. That's where Drain Punch comes in. I typically try to kill 2-3 pokemon with Conkeldurr and with my opponents that I have faced before, its a surprise adjustment.
Latios @ Focus Sash/Life Orb?
Timid Nature (252 SP. ATT/Speed EVs)
I love Latios simply because it is one of my favorite pokemon. It is almost never out-sped because of its fast speed, making it the fastest of the Eon pair. Psychic is for its great attack and STAB (as is Dragon Claw for its high crit-ratio, STAB, and effectiveness against dragons). Thunderbolt is to deal with annoying water types and other threats (Charizard, etc). Ice Beam is to deal with Dragon and Grass types because it is almost always 2x/4x when I face either of those types. I prefer Focus Sash because of Latios doesn't 1HKO, he's 1HKO'ed very easily while Life Orb is good for its increased attack :/
Gorebyss @ Focus Sash
Ability: Doesn't matter
I have though about a baton-pass shell smash Gorebyss to baton-pass shell smash onto Jirachi or Conkeldurr or Thundurus. I prefer Jirachi but all 3 are deadly with a buff like this. It's difficult for me because then I would want a white herb or something to try and fix the defensive stat-lowering and the question for me is what pokemon I would replace. It's hard because if this strategy fails, then I've basically wasted a slot that could be used as an offensive attacker. Criticisms are appreciated.
That's my team folks, suggestions are welcome and appreciated. If pokemon have to be pulled, please try to recommend a new one and (as I'm a stupid person,) provide just some base reason so I can see on the page as you. Thanks for the help!