There are two ways to achieve a critical hit every turn.
- Use Storm Throw or Frost Breath, which always results in a Critical Hit.
- If you have a Stage 3 or higher critical hit. These can be increased by the following:
- Use a move with a high critical hit ratio (Psycho Cut, Slash, Aeroblast, Blaze Kick, Attack Order, Air Cutter, Crabhammer, Cross Poison, Cross Chop, Drill Run, Karate Chop, Leaf Blade, Night Slash, Poison Tail, Razor Leaf, Razor Wind, Sky Attack, Spacial Rend, Stone Edge)
- Hold a Razor Claw, Scope Lens, Stick (Farfetch'd), Lucky Punch (Chansey)
- Have Super Luck as an Ability
- Using a Dire Hit, Focus Energy (+2), Comsuming a Lansat Berry
Any combination of 3 of those 4 classes will give you a 100% chance to land a crititcal hit. A combnation of Focus Energy plus any other class ALWAYS results in a critical hit, as it got buffed this generation.