Quick Pass

[November Blue]

Something similar to Nix's Haxorus in the OP:

Salamence @ Choice Band
Ability: Moxie
EVs: 160 HP / 252 Atk / 96 Spe
Adamant Nature (+Atk, -SpA)
-Outrage
-Earthquake
-Flamethrower
-filler

Kinda bulky Salamence with a Band and Moxie. Outrage becomes unfathomably powerful after just a single boost. This seems really good, why hasn't anybody suggested it?

 

[Bruno Magno]

Hasty | Justified
212 Atk / 44 SAtk / 252 Spe
- Close Combat
- Energy Ball
- Stone Edge
- Taunt​

After a Shell Smash, not many things can avoid a 2HKO, especially if you BatonPass before you get hit by a Dark-type move (eg. Celebi vs Tyranitar) and score another Attack boost. 212 Attack is to oneshot 252/0 Gyarados with Stone Edge when at +1, after the +2 (Shell Smash) and the -1 (Intimidate). Close Combat is the main STAB, to hit hard everything. Energy Ball is the STAB on the special side, while Taunt cripples foes that can't be 1HKO'ed, such as Forretress. Expert Belt gives a nice boost, and it's better than Life Orb as there isn't the recoil (Virizion is already too frail to priority, resisting only Aqua Jet). An Hasty nature with 252 Speed EV are recommended to tie with Rock Polish Terrakion, and to tie with Infernape and Terrakion when without boost, but if you don't care about them a 212 Atk / 64 SAtk / 232 Spd is viable. This set hits really hard even without boost, so ShellSmash is appreciated but not needed

 

[Razza]

Smash Passing to a sweeper with a choice item
Is quite frankly a terrible idea, even moreso when that sweeper will succumb to confusion from outrage after 2-3 turns.

The best smashpass sweepers are those with good mixed capabilities, notable mons include salamence, Lucario and Jirachi. It is important to note that the sweeper be neutral or resist priority. Therefore it is a good idea to pair Lucario and salamence with alternate recievers that resist ice shard and Mach punch respectively.

Lucario is probably the most effective IMO, a set of close combat, aura sphere, hidden power ice and dark pulse pretty much ohkos all of OU bar Tentacruel after a shell smash is passed to it.

 

[Pippy]

Smash Passing to a sweeper with a choice item
Is quite frankly a terrible idea, even moreso when that sweeper will succumb to confusion from outrage after 2-3 turns.

I beg to differ when it comes to CB or CSpecs. Having one of those items can boost your power to unbelievable levels, meaning that even neutral or uneffective moves (CB/CS cancels out the resist) will do massive damage. Locking yourself into Outrage isn't a bad idea either, as for those 2-3 you'll be nearly unstoppable, and whether you have a choice item or not, you'll still have to take the gamble of risking confusion hax or switching.