Pokemon Rework Thread:

Buff/nerf/rework any Pokemon in any way you want, whether the changes be small or big and as long as the changes fit the Pokemon's design and lore

Toxicroak:
+10 Attack, Special Attack and Speed
Tough Claws replaces Poison Touch
New Moves: Aqua Jet, Liquidation, Hydro Pump, Surf, Muddy Water, Flip Turn, Energy Ball, Giga Drain, Mach Punch, Fire Punch, Agility, Explosion

Conkeldurr:
Sheer Force is now a Hidden Ability
Own Tempo replaces Iron Fist
-10 Special Attack
+10 Defense

Machamp:
Steadfast now grants immunity to flinching, in addition to granting 2+ Speed when the Pokemon would normally be flinched. The speed boost also activates when the Pokemon is hit by moves with a sub-100% chance of flinching such as Bite and Astonish
-30 Special Attack
+20 Speed
+10 Defense
New Moves: Mach Punch

Mewtwo:
Now gains the ability Berzerk