Alright, for Super Singles I've recently figured out a strategy that works literally 99,99% of the time. The flaws in this strat are minimal. It already brought me up to 500 wins, and I'm definitely aiming for 1000+ with it. Here's the battle video:
EAZW-WWWW-WWXQ-7GZS
The Team
Durant @ Focus Sash/Choice Scarf
Ability: Truant
Nature: Jolly
EVs: 252 HP / 4 Def / 252 Spe
- Entrainment (other moves aren't necessarily needed)
- Protect
- X-Scissor
- Iron Head
Blaziken @ Leftovers
Ability: Speed Boost
Nature: Doesn't matter (mine's Jolly)
EVs: Don't matter (mine are 4 HP / 252 Atk / 252 Spe)
- Protect
- Substitute
- Hone Claws/Swords Dance
- Baton Pass
Cloyster @ Life Orb/Choice Band
Ability: Skill Link
Nature: Adamant
EVs: 4 HP / 252 Atk / 252 Spe
- Protect
- Icicle Spear
- Rock Blast
- Razor Shell
Strat explanatory
It's similar to some other strats I've seen on this thread. The strat basically revolves completely around Durant's Truant ability and using Entrainment to pass it onto the opponent. Just watch the battle video, it is pretty much self explanatory. If you're too lazy to download, or just don't have a DS/game, it works as follows:
Durant uses Entrainment on the opponent. Durant will pass its Truant ability onto the opponent, and that's basically Durant's one and only duty. This done, the battle is already decided in your favor in 99,99% of the cases. Your item can be Choice Scarf, just to be sure you outspeed the opponent. I personally am experienced with the good amount of hax that can occur (Quick Claw), hence I go for Focus Sash. This will allow me to get the Entrainment off.
After using Entrainment you immediately switch into Blaziken. Blaziken uses Protect whenever the opponent gets to attack, and uses stat upping moves whenever the opponent is loafing around every other turn. This will allow you to get a sub up, get +6 Attack, +6 Speed, and +6(?) Accuracy. The Speed Boost ability is mandatory here, as you get a free +1 Speed from it after every turn. Leftovers come in really nice, because if you start with putting up your sub, your HP recovers gradually during Protecting/setting up. I first started off with Swords Dance in this set, but I later figured Hone Claws is way safer, as it allows you to let Cloyster use its Rock Blasts/Razor Shells without missing when you Baton Pass into it. Only downside to it is that it significantly stretches out the battle.
Here Cloyster comes in as a motherfucking beast on steroids. You send him out when your opponent is about to loaf around. This Life Orbed/Choice Banded kid now has +6 Attack, +6 Speed, and +6 Accuracy. The reasoning behind Adamant over Jolly is that you're +6 Speed anyways, so you naturally outspeed any mon. You're basically set to sweep. It can basically OHKO anything except for a few encounters. The reason I'm opting to go for Choice Band is that nothing is immune to Ice. A +6 Choice Banded Adamant Cloyster will OHKO almost anything. And if it doesn't, you have the sub that protects you as well. I'm still hesitating between Life Orb and Choice Band though. I think I'm gonna go with Life Orb, since Choice Band locks you into one move. And since the Battle Maison is the temple of hax, I'd rather avoid 3 critting priority moves by being able to use Protect.
Potential survivors (calcs)
These are calculated with the opponent having a Defense upping nature.
+6 252+ Atk Life Orb Cloyster Rock Blast (5 hits) vs. 252 HP / 252+ Def
Empoleon: 130-155 (68 - 81.1%) -- guaranteed 2HKO
+6 252+ Atk Life Orb Cloyster Razor Shell vs. 252 HP / 252+ Def
Klinklang: 195-230 (116.7 - 137.7%) -- guaranteed OHKO
+6 252+ Atk Life Orb Cloyster Razor Shell vs. 252 HP / 252+ Def
Magnezone: 195-230 (110.1 - 129.9%) -- guaranteed OHKO
+6 252+ Atk Life Orb Cloyster Icicle Spear (5 hits) vs. 252 HP / 252+ Def
Poliwrath: 190-220 (96.4 - 111.6%) -- approx. 68.8% chance to OHKO
+6 252+ Atk Life Orb Cloyster Rock Blast (5 hits) vs. 252 HP / 252+ Def
Forretress: 190-225 (104.3 - 123.6%) -- guaranteed OHKO
+6 252+ Atk Life Orb Cloyster Rock Blast (5 hits) vs. 252 HP / 252+ Def
Carracosta: 195-235 (107.7 - 129.8%) -- guaranteed OHKO
+6 252+ Atk Life Orb Cloyster Razor Shell vs. 252 HP / 252+ Def
Aegislash-Shield: 160-188 (95.8 - 112.5%) -- 75% chance to OHKO
+6 252+ Atk Life Orb Cloyster Rock Blast (5 hits) vs. 252 HP / 252+ Def
Suicune: 220-260 (106.2 - 125.6%) -- guaranteed OHKO
+6 252+ Atk Life Orb Cloyster Razor Shell vs. 252 HP / 252+ Def
Registeel: 160-188 (85.5 - 100.5%) -- 12.5% chance to OHKO
+6 252+ Atk Life Orb Cloyster Razor Shell vs. 252 HP / 252+ Def
Cobalion: 177-211 (89.3 - 106.5%) -- 37.5% chance to OHKO
+6 252+ Atk Life Orb Cloyster Razor Shell vs. 252 HP / 252+ Def
Metagross: 177-211 (94.6 - 112.8%) -- 75% chance to OHKO
+6 252+ Atk Life Orb Cloyster Razor Shell vs. 252 HP / 252+ Def
Bronzong: 192-227 (110.3 - 130.4%) -- guaranteed OHKO
Note that some of these could've been possible 2HKO's instead of OHKO's if Cloyster had a Jolly nature.
Flaws
Priority
As I mentioned earlier, opponents with priority moves might by a slight chance throw Cloyster off. Think Prankster T-Wave. Hasn't happened to me yet though.
Quick Claw
If you manage to run into an opponent with Quick Claw you cannot OHKO and that can do serious damage to Cloyster, and the Quick Claw triggers twice in a row, you might lose. The chances of this happening are almost zero, but you know how they roll in the Battle Maison (right, Walrein?)
Protect/Flinches
If you manage to run into a Protect user on turn 1, and you use Entrainment, you're pretty much screwed as you're now loafing around yourself next turn. Not much you can do, unless you have the luck your opponent cannot kill you. Same goes for moves like Fake Out. You might want to opt running Protect on Durant to predict the Fake Out, but then you have to be lucky to outspeed your opponent and not get 2HKO'd. The flinch issue also goes for Cloyster. Perhaps you run into some Fake Out + priority move users that are super effective and crit or whatever. Anything can happen in the Battle Maison.
Moves that ignore sub
Combined with hax such as critical hits, this might be devastating.
Ganlon Berry
Ganlon Berry holders take less damage from physical attacks. The rest is self explanatory.
Feel free to leave any feedback and suggestions. They will be greatly appreciated. I'll post an update when I reach 1000+ or lose in the process.