Bisharp [Optimized]
Abilities: Defiant / Inner Focus / Iron Barbs (HA)
Stats: 80 HP / 130 Atk / 110 Def / 60 SpA / 90 SpD / 100 Spe | BST: 570
Added Moves: Parting Shot, Bullet Punch, Fire Punch, Ice Punch Thunder Punch, Meteor Mash
Summary of Changes: +15 HP, +5 Atk, +10 Def, +20 SpD, +30 Spe
Bisharp mainly uses Defiant to deter Defog users, and it is a Swords Dance user with powerful Knock Offs, Sucker Punches, and Iron Heads. However, it kind of fell out of use due to the persistent power and speed creeps as well as things like the introduction of the Island Guardians and the nerf to Sucker Punch. Optimized Bisharp gets Bullet Punch for an extra STAB priority as well as the elemental punches for coverage. Ice Punch in particular hits Pokemon like Landorus-T and Dragonite hard. Parting Shot provides a pivot move that supports its teammate. Iron Barbs, while not punishing Defog, allows Bisharp to punish contact attackers and Rapid Spin users.
Avalugg [Optimized]
Abilities: Refrigerate / Ice Body / Sturdy (HA)
Stats: 110 HP / 117 Atk / 184 Def / 44 SpA / 86 SpD / 28 Spe | BST: 569
Added Moves: Icicle Crash, Aurora Veil, Stealth Rock, Explosion
Summary of Changes: +15 HP, +40 SpD
Avalugg is a Rapid Spinner with monstrous physical bulk and a good attack stat, but it had terrible special bulk and speed. It also didn't have a strong physical Ice STAB. Refrigerate is very useful for a Rapid Spin user, as it prevents Ghost-types from spin blocking just by being there. It also provides Avalugg with stronger Ice STABs in Return/Frustration and Double-Edge. It gains Explosion to go out with a bang, punching a hole in the opposing team. If used on a hail team, it can now set Aurora Veil as well to help support its team further.
Qwilfish [Optimized]
Abilities: Saturate* / Swift Swim / Intimidate (HA)
Stats: 80 HP / 115 Atk / 85 Def / 55 SpA / 85 SpD / 105 Spe | BST: 525
Added Moves: Rapid Spin, Zen Headbutt, U-turn
Summary of Changes: +15 HP, +20 Atk, +30 SpD, +20 Spe
Saturate - Water-type -ate
Qwilfish absorbs Toxic Spikes, can set Spikes or Toxic Spikes itself, and uses Explosion to make holes. However, base 95 Attack was too low to be threatening without a Swords Dance, giving the opponent a chance to switch in a counter. It also had low bulk and only moderate speed, so it could be beaten before doing what it needed to do. Optimized Qwilfish gets Rapid Spin to help remove other hazards besides Toxic Spikes, and Zen Headbutt hits opposing Poison-types like Toxapex. While normally used with Swift Swim on rain teams, it gets a new custom ability in Saturate that turns its Rapid Spin and Explosion into Water-type attacks, with Saturate Explosion dealing huge damage to threatening Pokemon like Heatran, Landorus-T, and Volcarona.
Shuckle [Optimized]
Abilities: Sturdy / Unaware / Magic Bounce (HA)
Stats: 50 HP / 10 Atk / 230 Def / 10 SpA / 230 SpD / 5 Spe | BST: 535
Added Moves: Haze, Recover, Aromatherapy, Formian Suplex*
Summary of Changes: +30 HP
Formian Suplex:
Shuckle is best know for being a semi-bulky Sticky Web setter. It has no offensive presence due to extremely low offensive stats, though it did have Encore to discourage set up. Optimized Shuckle gains more hitpoints, reliable recovery, Aromatherapy for team support, and Haze to clear opponents' stat boosts. Formian Suplex is a Bug-type Seismic Toss which prevents Shuckle from being too passive, and no type is immune to it. While Sturdy can be useful for guaranteeing hazards, its increased bulk means it probably won't be knocked out by any one attack, so it gets Unaware to switch into set up attackers or Magic Bounce to prevent opposing hazards from being set as well as protecting it from moves like Toxic and Will-O-Wisp.