help with pokemon rumble blast (not hypothetical this time) (for the love of god please help me)

[snow rat]

basically every file in this game's rom is either a .arc file or a .bcres.cx file. i don't know what to do with either of these and i can't find any info on this. i've done stuff with PSMD before but that was mostly with a tool made for pmd and kecleon aside it was fairly easy to navigate the files. this, though? it's a game like 5 people care about that has little to no research on it.

apparently someone else had this same issue back in like 2015 and nothing ever came of it. because of course.

for the record, my endgoal is to find the models because while stuff from rumble world is on models resource, there's nothing from this one and i want to be sure they're actually the same. finding non-pokemon models especially would be pretty cool...