Gastrodon

Sea Slug Pokémon ^#423

It secretes a purple fluid to deter enemies. This fluid isn’t poisonous—instead, it’s super sticky, and once it sticks, it’s very hard to unstick.

Its body is covered in a sticky slime. It’s very susceptible to dehydration, so it can’t spend too much time on land.

- Sticky-Hold
  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.
- Storm-Drain
  All other Pokémon's single-target water-type moves are redirected to this Pokémon, if it is an eligible target. Other Pokémon's Water moves raise this Pokémon's Special Attack one stage, negating any other effect on it, and cannot miss it. If the move's intended target also has this ability, the move is not redirected. When multiple Pokémon with this ability are possible targets for redirection, the move is redirected to the one with the highest Speed stat, or, in the case of a tie, to a random tied Pokémon. follow me takes precedence over this ability.

- Sand-Force
  During a sandstorm, this Pokémon's rock-, ground-, and steel-type moves have 1.3× their base power. This Pokémon does not take sandstorm damage, regardless of type.

Their shape and color change depending on their environment and diet. There are many of them at beaches where the waves are calm.