Final Fantasy Legend III

Released in 1991 on the original Game Boy, Final Fantasy Legend III (known as SaGa 3: Jikuu no Hasha in Japan) is a unique entry in the SaGa series, masquerading as a Final Fantasy title in the West. While it might share some thematic threads with the wider FF universe, it's really doing its own thing – a blend of the familiar and the bizarre that's made it a cult classic.
Forget your stereotypical heroes and villains for a moment. In this game, you're thrown into a desperate race against time itself! An apocalyptic "Water Entity" threatens to consume all of existence, and four orphaned children are the only ones with the potential to stop it.
Prepare to pilot time machines, battle mutated monsters that can transform mid-fight, and unravel a complex narrative that spans multiple timelines. Get ready for a challenge too, because Legend III doesn't pull any punches with its unique stat-growth system and unconventional gameplay.
So, if you're looking for a portable RPG experience that's got a healthy dose of time travel, monster mutations, and a whole lot of retro charm, then Final Fantasy Legend III is your ticket!