Being a side game requiring a battery-hungry peripheral from one of the last games on a console with a short market lifespan, I'm not terribly surprised that Chao Adventure 2 is not well documented.
But when I start up the game and my chao informs me that it needs my help because it lost the Chao thing, like the little hovering emotion ball they have, and no, that thing on its head right now is actually a baseball it's using to save it from being too embarrassed, that lack of knowledge is clearly not merely a shame but downright tragic.