Pokémon: Beldum, Metang, and Metagross

Description:

"The Pokémon always moves last, but never misses."

Effect:

The user's moves are all given -1 priority, but bypass accuracy checks and can hit targets in semi-invulnerable states such as during Dig or Fly.

Pokémon: Tatedge, Tublade, and Solanash

Description:

"Slicing moves are powered up and may poison targets."

Effect:

Slicing moves get a 20% damage boost and have a 20% chance to poison a target.

Pokémon: Ralts, Kirlia, Gallade, and Gardevoir

Description:

"Reduces HP when attacking, but increases move damage."

Effect:

When using a damaging move, the user loses 10% of their max HP, but their damage is increased by 30%.

Pokémon: Perrserker

Description:

"Doubles effects of berries for all Pokémon in battle."

Effect:

When Pokémon with this ability is battle, the effects any berries eaten by any Pokémon on the field- including opponents- are doubled.

(Sitrus Berries heal 1/2 of a Pokémon's health instead of 1/4, Salac Berries give +2 Speed instead of +1, etc.)

Pokémon: Lapras

Description:

"Gains protection from status effects and Ghost-type moves."

Effect:

Grants an immunity to status effects such as Burn or Poison, and halves the damage taken from Ghost-type attacks.

Pokémon: Abra, Kadabra, and Alakazam

Description:

"Restores ally's HP a little when entering battle."

Effect:

When sent out in a double battle, their ally heals for up to 25% of its max HP.

Pokémon: Mudbray and Mudsdale

Description:

"Boosts speed and critical hit ratio when Intimidated."

Effect:

When its Attack stat is lowered by the ability Intimidate, it gains +6 to its Speed, and its Critical Hit rate is boosted by 2 stages.

(2 stage crit boost = 50% crit chance, or 100% crit chance if holding Scope Lens or Razor Claw.)