I know it's late into QC but I'm surprised no-one has came across this set
Charizard @ Charizardite X
Ability: Blaze
EVs: 252 Atk / 4 SDef / 252 Spd
Jolly Nature
- Flare Blitz/Dragon Claw
- Focus Punch
- Roost
- Substitute
This set abuses the fact that charizard can learn focus punch and that focus punch is affected by tough claws too. You can come in on something like ferrothorn for example, sub up as they switch out or bravely try to leech seed, roost back your hp if you came in on sr, then proceed to destroy teams from behind a sub. Focus Punch is your way of getting past Heatran and Blissey/Chansey who are trouble due to recoil damage and you have no boosting move. Flare Blitz is thrown in for a hard hitting stab that hits neutral on fairies that would otherwise wall you if you ran Dclaw+FocusPunch. Focus Punch is preferred over EQ on this set since with Tough Claws Focus Punch is 195 BP, while EQ remains at 100. Since Flare Blitz is 224 BP with stab and Tough Claws you can see that this set requires no boosting moves.
252 Atk Tough Claws Mega Charizard X Focus Punch vs. 252 HP / 252+ Def Blissey: 770-908 (107.8 - 127.1%) -- guaranteed OHKO
252 Atk Tough Claws Mega Charizard X Focus Punch vs. 252 HP / 252+ Def Eviolite Chansey: 564-664 (80.1 - 94.3%) -- guaranteed 2HKO
252 Atk Tough Claws Mega Charizard X Focus Punch vs. 252 HP / 0 Def Heatran: 406-478 (105.1 - 123.8%) -- guaranteed OHKO
With a FP/FB combo you can 1-2hko quite a lot of pokemon, the only known exceptions to me at the moment are Charizard-Ys, Chandelure, Gyarados, Dragonite, Salamence, Garchomp (who survives and outspeeds), as well as Noivern (though infiltrator sucks at least it demotes it to a check) which is why Dragon Claw is slashed on the set so you can prioritise which may be bigger threats to your team.
I included a replay to show you what I'm talking about
http://replay.pokemonshowdown.com/ou-77063597
Once again, sorry that it's so late in QC I just don't check these analyses much.