Hokeymon is the name of a card game that Billy and Irwin are addicted to. It's a parody of Pokemon and possibly Yu-Gi-Oh!, it prominently appears in the episode It's Hokeymon!, Grim watches Billy and Irwin play the game and doesn't really understand it so he decides to bring the hokeymonsters to life which excites Billy and Irwin, Grim tells them that they can never show the monsters to other kids but naturally they do show them to other kids to demand to know where he got them from so they crowd around Grim to bring their monsters to life too, soon the monsters get out of control and overrun Endsville, so Mandy decides to create her own hokeymonster to wipe out the others by turning them into toast and eating them. Most of the Hokeymonsters were voiced by Frank Welker.