Beheeyem is a tan extraterrestrial Pokémon with an oblong head that features depressions on both sides. It has black, symmetrical lines going down the front of its head. Under the rim of its head, there lay two glowing green eyes with small black pupils. It has a tan "collar" and four dots on its chest of the same color. Beheeyem's arms have three finger-like digits: one red, one green, and one yellow. It has a rim underneath its main body, under which are two small legs.
Beheeyem communicates by flashing its multicolored fingers. It can also change the memories of its opponents, being able to erase or even rewrite them.
The communication through lights and sound on the colored fingers could be a possible reference to close encounters of the third kind, where they used lights and beeping sounds to communicate with the aliens, further showing the possibilities of this Pokémon being an alien.
Also in the anime, the Beheeyem have a spaceship considering that they are aliens.
Beheeyem is based on an extraterrestrial life-form.
Beheeyem's name makes the sounds of the letters B.E.M, which stands for; Bug Eyed Monster, a term some people used for aliens in alien sightings.