Pocket Monster is an unlicensed platformer based off the Pokémon series for the Mega Drive and SNES. The SNES version is credited to DVS Electronic Co., while the Mega Drive iteration seems to be developed by ex-workers from Chuanpu and published by X Boy.

Like the Famicom pirate, the player controls Pikachu through numerous side-scrolling levels with a boss at the end of each. Pikachu can jump on enemies and uses a special move which clears all of the enemies on the screen, although the latter can only be done when the charge meter is full (SNES) or if the player has collected at least twenty points of energy (Mega Drive.) The player can change how many lives and continues they can have, and there's a difficulty setting in the options menu that will affect how much health Pikachu loses when he is hit by an enemy. A sequel to this game was made for the Mega Drive called Pocket Monster II, while a similar game, Pokémon Gold Silver, was made for the SNES.

The backgrounds and foregrounds appear to be taken from numerous Mega Drive games, including Tiny Toon Adventures: Buster's Hidden Treasure, Mr. Nutz, QuackShot Starring Donald Duck, Magical Taruruuto-kun (of which was, coincidentally, developed by Game Freak, the company behind Pokémon itself) and Monster World IV, although the graphics from the latter aren't present in the SNES version and instead uses ones taken from Skyblazer instead. The graphics in some parts of the game such as the intro, title, stage start and ending screens are based off of screen captures from the Pokémon anime.

Although some of the enemies encountered are Pokémon such as Beedrill, Porygon and Diglett, the other "Pokémon" are taken from Magical Taruruuto-kun, Syd of Valis (notably the lizard enemy seen in the first level) and Super Metroid with different palettes.