During the time of pirates, Dheldile were often a part of crews, and paid with bananas. Dheldile have a proclivity for forming rivalries with ape Pokémon; it's unclear if this originated in the past or is a recent development.
It can expand the focus of its eyes, enabling it to see objects in the far distance as if it were using binoculars. The soul of seaweed adrift in the waves became reborn as this Pokémon.
