Nihilego [Optimized]
Abilities: Beast Boost
Stats: 109/29/79/109/131/113
Added Moves: Recover, Rapid Spin
Summary of Changes: -24 Atk, +32 Def, -18 SpA, +10 Spe
Description: With these changes, Nihilego becomes more of a special wall, since its offensive capabilities leave much to be desired. A slight boost in speed allows it to still have use in OU as an offensive hazard setter, while recovery and Rapid Spin gives it a niche in checking powerful attackers like Charizard-Mega-Y, Blacephalon, and Tornadus-Therian.
Buzzwole [Optimized]
Abilities: Beast Boost
Stats: 107/127/137/43/83/73
Added Moves: Circle Throw, U-Turn
Summary of Changes: -12 Atk, -2 Def, -10 SpA, +30 SpD, -6 Spe
Description: Buzzwole can now be more comfortable as a physical wall, gaining a much appreciated boost in its Special Defense, being able to pivot, and becoming less passive against attackers it cannot hit effectively with pseudohazing.
Xurkitree [Optimized]
Abilities: Beast Boost
Stats: 89/89/67/157/67/101
Added Moves: Shadow Ball, Hex
Summary of Changes: +6 HP, -4 Def, -16 SpA, -4 SpD, +18 Spe
Description: Xurkitree can use its added STAB to its advantage, using Z-Hypnosis and Hex for big damage. A loss in Special Attack is compensated for in a increase in Speed, but its secondary typing can also curse it (no pun intended) with its weakness to Pursuit and Sucker Punch.
Guzzlord [Optimized]
Abilities: Beast Boost
Stats: 151/101/89/103/97/29
Added Moves: Strength Sap, Dragon Hammer
Summary of Changes: -72 HP, +36 Def, +6 SpA, +44 SpD, -14 Spe
Description: Guzzlord loves its improved bulk along with good support moves in Slack Off, Knock Off, and Dragon Tail. With it, it can check Blacephalon, Serperior, and Victini. It could potentially also see use on Trick Room teams due to its lowered speed.
Stakataka [Optimized]
Abilities: Beast Boost
Stats: 67/149/179/53/109/13
Added Moves: Curse, Spikes
Summary of Changes: +6 HP, +18 Atk, -32 Def, +8 SpD
Description: Stakataka now has a much better typing to abuse Trick Room, and Curse so it doesn't have to rely on fainting a mon for Attack boosts. It can also use a defensive set with Stealth Rock and Spikes. Stakataka still struggles against Skarmory, Tangrowth, and bulky Water types, though.
Blacephalon [Optimized]
Abilities: Beast Boost
Stats: 53/137/53/137/59/131
Added Moves: Gunk Shot, Fire Lash
Summary of Changes: +10 Atk, -14 SpA, -20 SpD, +24 Spe
Description: Blacephalon now functions as a speedy revenge killer, outspeeding Tapu Koko and OHKOing it with Gunk Shot. It can afford to run a mixed set due to its offensive stats and useful attack in Fire Lash. It still loses hard against Tyranitar, though.