Skrelp

X / Omega Ruby: Camouflaged as rotten kelp, they spray liquid poison on prey that approaches unawares and then finish it off.

Y / Alpha Sapphire: It looks just like rotten kelp. It hides from foes while storing up power for its evolution.

Ultra Sun: It vanishes into seaweed and remains perfectly still to avoid attacks from large Pokémon. Rotten seaweed is its main food source.

Ultra Moon: It’s not good at swimming, so it clings to the seaweed. In the Alola region, it’s often found near Dhelmise.

Sword: It drifts in the ocean, blending in with floating seaweed. When other Pokémon come to feast on the seaweed, Skrelp feasts on them instead.

Shield: Skrelp looks like a piece of rotten seaweed, so it can blend in with seaweed drifting on the ocean and avoid being detected by enemies.