Very rare and unlicensed game by Makon Soft. Release date unknown.
Was shockingly hard to find info on this game. Found some info here. Looks like this game was meant for batch raising Digimon. You could even manipulate time and do all kinds of little hacks in it. It has a transfer device on the top of the cart so you can use it with real digivices too apparently. More information can be found on this very outdated site here: