Sticky Hold

Prevents a held item from being removed by other Pokémon.

Full effect

This Pokémon's hold item cannot be removed by other Pokémon. Damaging moves that would remove this Pokémon's item can still inflict damage against this Pokémon, e.g. Knock Off or Pluck. This Pokémon can still use moves that involve the loss of its own item, e.g. Fling or Trick. Overworld: If the lead Pokémon has this ability, the encounter rate while fishing is increased.

In game description

The Pokémon's held items cling to its sticky body and cannot be removed by other Pokémon.

Pokemon with Sticky Hold

#0088

Grimer #0089

Muk #0316

Gulpin #0317

Swalot #0422

Shellos #0423

Gastrodon #0568

Trubbish #0617

Accelgor #1011

Dipplin hidden #1019

Hydrapple hidden

Using Sticky Hold in Cobblemon

Abilities are passive and always active, so Sticky Hold costs you nothing to run. If it is marked hidden on a species above, expect it to be harder to obtain: servers differ in whether hidden abilities come from breeding, an Ability Patch, or events.

See the Pokedex for which abilities each species can have, and IVs, EVs and breeding for how to actually pass one down.