Play via emulation first (WonderSwan emulators work well) before seeking a physical copy.
If both Digimon have their evolution gauges full, they could perform a dual cinematic attack. Imagine Omnimon and Gallantmon Crimson Mode clearing the screen of D-Spirits in one go. Why This Fits Ver. 1.5 digimon tamers battle spirit ver. 1.5
However, the version of the game that most western fans played—the Game Boy Advance port released in 2002—was not the definitive experience. There existed a "phantom" update, released only in Japan for the WonderSwan Color, that expanded the roster, refined the mechanics, and offered a truer conclusion to the Digital World saga. Play via emulation first (WonderSwan emulators work well)