Top: Gardman, also known as Wonder Rabbit, Diveman, Monster Brother, and Five Kids is an unlicensed Famicom game that commonly appears on "Famiclone" plug and play consoles. The game is a simple 2D platformer where the player can swap between five characters with unique abilities.
Middle: While the Gardman and Wonder Rabbit versions of the game were widely available and dumped as early as 2011, assets based on a Pokémon version of the game existed unused in the files of almost every version, with five unique sprites corresponding to the game's five playable characters. It was long theorized that this lost Pokémon version was the original, which all later original reskins were based upon.
Bottom: In 2022, the original version of the game was finally found by unlicensed gaming aficionado taizou_hori and later dumped. Properly known as "Pikachu5", the game was found on a Famiclone imitating the PlayStation 5 called the "Retro Station NX-85"
Sources: The Cutting Room Floor, taizou_hori
