So we did a lot of things. You'll find Sun and Moon styled pre-battle mugshots of Hitmonchan, Hitmonlee, and Hitmontop in here courtesy of Shyacinth, animated Pangoro and Tyrantrum sprites (and Terry Crews) by LlamaMinister (though he didn't make the original P and Ty sprites so check the credits), and I made a whole lotta custom music which is now open source. So yeah, as long as you can keep up with my messs of credits you're free to use the stuff in here. Have fun, dudes!
There's a text file in here with the smaller details. The actual custom stuff for this jam though:
Custom Pre-Battle Mugshots of the Hitmons
Custom Animations and Terry Crews
Custom Music and Portraits