Mario Sports Mix also has .mot files, but RandomTBush has had no luck figuring out the compression that those files use; this also applies to the game's .mdl and .bin files.
Anyway, if this unknown compression is figured out, it could lead to another hackable game.
And iirc Mario Sports Mix uses .mot files slightly differently than Tatsunoko Vs. Capcom. Either that or it's simply a compressed version of it and I'm over thinking things
Mario Sports Mix uses CHR0s for the animations, just compressed in the *.MOT files. I just never really bothered to extract them from the memory dumps I've been making, really.