People don't talk enough about WonderSwan. I wanna learn more about WonderSwan! Like Hataraku Chocobo, the exclusive farming simulator for the handheld, featuring the Final Fantasy bird. Basically, the game mashes my favorite part from Final Fantasy VII, the Chocobo farm, with the M.U.L.E. gameplay systems. You can play an English translation here.
When not exploring expanses and taming Chocobo, you put them to work in nearby locales, to mine and collect resources, after which you trade with competitors. You can even sabotage opponents. As a neat trivia, the game is also in full color, despite technically releasing before the Color version of the handheld (via @Kimimi). Kweh!