In other gens:

King's Rock

Holder's attacks without a chance to make the target flinch gain a 10% chance to make the target flinch. Evolves Poliwhirl into Politoed and Slowpoke into Slowking when traded.

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Pokemon with a moveset recommending this item

Cloyster

Water
Ice

Shell Armor
This Pokemon cannot be struck by a critical hit.
Overcoat
This Pokemon is immune to powder moves, Sandstorm or Hail damage, Effect Spore.

Skill Link
This Pokemon's multi-hit attacks always hit the maximum number of times.

Atk

Def

180

SpA

SpD

Spe