I once had the Japanese version of Digimon world 2 for the PS1 and I remember it having a separate game mode that, by default, would put you in an arena with Metal Greymon vs Were Garurumon. For whatever reason, the fight played fully automatically, no input needed, but if you messed around with buttons, you could sometimes change the attack of M.Greymon to the breast missile. After the fight was over, you’d be thrown back at the main menu.
I’ve never seen anyone comment on it and even searching right now doesn’t show any results. So, does anyone know what it was supposed to be and how to “properly play” it? Cutting room floor only mentions that western releases completely removed all compatibility with the Japanese gadgets and graphics related to that
PocketStations aren’t actually that rare or expensive. A quick look on eBay has them going for around $30 (unless you want a black one). The battery will definitely need replacing, but it’s just a CR2032 (the same as a Dreamcast’s VMU) and a pack of 10 of those is under $10. The Pocket Digimon World games aren’t too expensive either with the original going for around $20 and the other two being around $30 each. All together that does add up to quite a bit, but it isn’t that bad when there are some games out there that go for hundreds.
It is possible to bypass the region lock with a mod chip (requires soldering) or an exploit like Tonyhax International (requires a memory card, a way to install the exploit, and possibly one of several specific games).
Edit: Typo
Depending where you live, a modded PS1 is easier to find than an unmodded one. Brazil, for instance