I finally got around to getting all the statues in Alpha Sapphire! :)
I am also posting because I have achieved a decent streak in Super Doubles.
The team I used on my Doubles steak consisted of:
Westside (Garchomp) (M) @ Life Orb
Ability: Rough Skin
Nature: Jolly
IVs: 31/31/31/x/31/31
EVs: 4 HP / 252 Atk / 252 Spe
-Dragon Claw
-Protect
-Rock Slide
-Earthquake
Earthquake spam alongside Charizard was deadly in most situations. Protect was used quite often in situations where the opponent had Pokemon that threatened Garchomp but Charizard could take out. Rock Slide is perhaps not the best choice for the Battle Maison due to its low accuracy, but it generally did what I needed it to do. Dragon Claw was accurate and reliable STAB that dealt decent damage against most opponents, and could be used to take out opposing Dragons.
Charizard (M) @ Charizardite Y
Ability: Blaze
Shiny: Yes
Nature: Timid
IVs: 31/x/31/31/31/31
EVs: 4 HP / 252 SpA / 252 Spe
-Solar Beam
-Protect
-Heat Wave
-Flamethrower
My lead along with Garchomp. Mostly spammed Heat Wave in sunlight, using Flamethrower when it was crucial to hit. Protect functioned similarly to how it did with Garchomp; it allowed Garchomp to take care of Pokemon targeting Charizard. I found that most Pokemon that knew Stone Edge or Rock Slide would almost definitely target Zard with it, so Protect allowed me to play around that. Solar Beam helped handle bulky Water-types and took care of Swampert and Gastrodon.
So Takei (Sylveon) (M) @ Pixie Plate
Ability: Pixilate
Nature: Modest
IVs: 31/31/31/30/30/31
EVs: 252 HP/ 204 Sp. Atk / 46 Def. / 8 Spe.
-Psyshock
-Protect
-Hidden Power Ground
-Hyper Voice
Sylveon helped cover Charizard/Garchomp's weakness to things such as Tyranitar. Hyper Voice was the main attack for the damage output and ability to hit both targets, although Hidden Power Ground came in handy sometimes. Unlike Charizard and Garchomp, Sylveon could also function decently in Trick Room. I forget exactly what the spread does, but it gave it decent bulk and hard-hitting SpA.
Fetish (Conkeldurr) (F) @ Assault Vest
Ability: Guts
Shiny: Yes
Nature: Adamant
IVs: 31/31/31/x/31/31
EVs: 252 Atk / 252 SpD / 4 Def
-Ice Punch
-Knock Off
-Drain Punch
-Mach Punch
Assault Vest Conkeldurr is fairly bulky, especially with Drain Punch. This allowed me to switch it in to things that Charizard/Garchomp had trouble with, such as Claydol, Regirock, and Landorus. Conkeldurr was able to function under Trick Room and Mach Punch was quite useful for picking off weakened foes inside and outside of it. Knock Off was a good utility move, although in hindsight it may have been better to have a Knock Off user who could more effectively deal with Lax Incense Latios.
Losing battle video: 6CCW-WWWW-WW3F-4KLF
How I lost: My losing battle was battle 185, against Veteran Sibyl. There's not much to say other than I wasn't paying as much attention to the battle as I should have been, played poorly, and lost because of careless mistakes. I'm sure the battle could have been won if I had been fully focused on it and thought through my moves better (for example, not letting Charizard get OHKOed right off the bat). It really came down to me playing poorly and being in a bad position at the end of the match due to careless mistakes I had made early on.
Threats: One major Pokemon to look out for when using this team is Gyarados. After an Intimidate, neither Garchomp nor Charizard can OHKO it and it can spell disaster if you let it set up too many Dragon Dances. Another threatening Pokemon is Tyrantrum because before you know the set it's hard to tell if it will try to Dragon Claw Garchomp or Stone Edge Charizard. Either way, it is often best to dispatch it quickly with Dragon Claw. Barbaracle is dangerous for the similar reason of having sets that can threaten both Charizard and Garchomp, and should also be taken out as quickly as possible. Situations where the opponent has a pokemon that threatens Garchomp and another Pokemon that threatens Charizard are tricky and must be carefully played around (ie. The opponent leads with Entei and Regice). The basic rule of thumb on the first turn is to be on the lookout for Pokemon with Ice or Rock moves and maneuver around them accordingly.
Conclusion: This team is very easy to use and is capable of getting a decent streak, but is bound to fail eventually due to the reliance on low accuracy moves. That being said, I think it did quite well considering that! I fully expected to be haxxed out on the first Lax Incense user I met, but it held up against hax far better than I expected it to and managed to net me my highest streak yet!