Power Stone (both) were great but inevitably there's always the one person who hangs back and avoids combat to stealthily get all the stones to transform, making it unfun for casual or new players.
I know because I was that person. I was a big fan of a little known game called Armada on the DC, as well as Jambo Safari and the 2k Sports games.
Hey, tbf, I never owned a Dreamcast, just played the games my mate had. 3 nights of drinking at uni, sleeping on his easy chair, it wasn't ideal. So I'd play all night and he'd wake up with a bunch of unlocked characters lol. He never had Power Stone 2 IIRC. Not my bad!
To be honest a big part of this was that it was a quasi-loot game. You had to do the rpg type mechanic where you plugged a bunch of items together that you get dropped after playing and do a ton of items synthesis. It kept you playing for ages to try new unlocks.
I'm sure the game wasn't balanced well for characters either but for the average little shitass it was great.