a little later than what I expected but w/e
Kyurem-Black @ Life Orb
Ability: Teravolt
EVs: 4 Atk / 252 SpA / 252 Spe
Rash Nature
- Ice Beam
- Earth Power
- Fusion Bolt / Iron Head
- Roost / Hidden Power Fire
Kyu-B is pretty retarded against BO teams. BO will have slower teams than the likes of Hyper Offense, which is what KyuB thrives against. It's great coverage shreds everything, especially with Teravolt ignoring Levitate and Thick Fat. It breaks a bunch of common mons you typically find on BO, stuff like Venusaur, Hippo, Heatran, Rotom-W, Starmie, and even Scizors with HP Fire. Though it is threatened by pretty much anything faster (stuff like Timid M-Gardevoir, Latis, Keldeo, MegaGross, Jirachi, and Fast Garchomps etc, it's still really scary to face because of how limited it switchins really are and how difficult it can be to play around without anything faster.
Thundurus (M) @ Life Orb
Ability: Prankster
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Thunder Wave
- Thunderbolt
- Hidden Power [Ice] / Grass Knot
- Focus Blast
Thundurus just fucks everything over, no matter what you do. It's dickish speed tier screws over the crowded 108-110 tiers and it hits stupidly hard with its 125 SpA and bunch of high BP coverage moves. There are no surefire answers to Thundy, but your best bets are Mega Venusaur, Hippowdon, offensive Starmie, Raikou, Mega Manectric, and Weavile. Luckily it's held back by its annoying weakness to Stealth Rock and frailty.
Hoopa-Unbound @ Life Orb
Ability: Magician
EVs: 136 Atk / 120 SpA / 252 Spe
Hasty Nature
- Gunk Shot
- Hyperspace Fury / Dark Pulse
- Psyshock
- Drain Punch
Hoopa-U has insane offenses and coverage which make it nearly impossible to switch into, as well as being able run move such as Nasty Plot or Substitute to break BO teams more easily. However it is severely hindered by its low Speed and low defense which leaves it weak to common priority and faster Pokemon. BO has a better matchup against Hoopa-U as it runs faster Pokemon or ones with priority such as Weavile, Azumarill, Scizor, Charizard X, and Keldeo.
Weavile @ Life Orb
Ability: Pressure
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Icicle Crash
- Ice Shard
- Knock Off
- Low Kick / Poison Jab / Swords Dance
125 Speed coupled with the two best types to have STAB on in the meta make Weavile a scary threat. It's really difficult for offensive teams to switch into because it's hard to prepare for Weavile and Klefki is like the only mon that can consistently counter it on BO, stuff like Clefable and Azumarill risk Poison Jab, Keldeo is really easily worn down but it works, and stuff like Terrakion and Ferrothorn risk Low Kick. Weavile is just really scary for offensive teams to face as they do not have much that can counter it.
Azumarill @ Choice Band
Ability: Huge Power
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Aqua Jet
- Waterfall
- Play Rough
- Superpower
Azu is pretty slow, but it hits insanely hard with its great coverage and priority. Huge Power allows Azu to reach around base 150 Atk, which means this thing is hitting as hard as Groudon. It's a risky Pokemon to play around too because one misplay can lead to it destroying your team with BellyJet and another misplay just leads to your mons dying to Banded Play Rough. Even though its ridiculous, it finds itself countered by Mega Venusaur and checked by a bunch of faster Pokemon such as Latis with Electric coverage, Thundurus, Raikou, Mega Manectric, EBall Manaphy etc.