ITT: Buff a Pokemon from each generation. The buffs can be as simple, or as complex as you want:

Gen 1: Tauros
New Stats:
HP: 75
Attack: 120 (+20)
Defense: 95
Special Attack: 30 (-10)
Special Defense: 70
Speed: 110
BST: 500
New Moves: Quick Attack, Flare Blitz, Bulk Up, Horn Leech
Move Buff: Wild Charge buffed to 120 base power

Gen 2: Quagsire
New Stats: 105/105/105/45/65/35/BST:460

Gen 3: Slaking
Ability Buff: Pokemon with Truant are now able to use status moves, during Truant turns

Gen 4: Mismagius
New Stats: 60/60/60/115/115/115/BST:525
New Abilities: Levitate/Magic Guard/(HA)Magic Bounce

Gen 5: Swoobat
New Stats: 77/47/55/112/55/119/BST:465
New Moves: Hurricane, Dazzling Gleam, Dark Pulse, Thunderbolt

Gen 6: Pangoro
New Stats: 110/134/98/39/71/68/BST:520
New Moves: Mach Punch, Sucker Punch, Fake Out
Ability Buff: Iron Fist damage boost is now 1.5x

Gen 7: Pallosand
New Stats: 95/65/120/105/85/30/BST:500
New Abilities: Water Compaction/Sand Veil/(HA) Sand Shield
Ability Buff: Water Compaction now grants a Water immunity
Sand Shield: 1.5x to both Defense and Special Defense, while in sand
New Moves: Will 'o' Wisp, Reflect, Light Screen, Nasty Plot, Trick Room, Hydro Pump, Scald

Gen 8: Barraskewda
New Ability: Storm Strike
Storm Strike: Boosts Attack and Special Attack by 1.5x, while in rain