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Game balancing? Game balancing.
Normal
> Unaffected by secondary status effects.
Poison
> Immune to poison
Psychic
> Immune to Confusion
Grass
> No Powder based moves work.
Ground
> Break stealth rock when coming in to battle.
Ice
> Water contact moves result in 50% chance of opponent being frozen solid.
Fire
> Cannot be burned.
Rock
> Breaks stealth rock when coming into battle.
Dragon
> Cannot be Taunted.
Water
> All Water types now have Water Absorb.
Bug
> Cannot be attracted.
Dark
> Cannot be embargoed, nightmare or tormented.
Fighting
> Cannot flinch.
Ghost
> Physical moves decrease in accuracy by 10%.
Steel
> Cannot be poisoned.
Flying
> Immunity to ground attacks.
Electric
> Cannot be paralyzed.
Fairy
> Cannot be trapped.