Thanks to @Baegislash for helping me convert my German Colosseum save to NTSC, I was able to do the E-reader battles again and make save states. Here is a set of Japanese Colosseum E-reader shadow Pokemon save states.
The OT name has been changed to PPorg and the TID/SID have been changed to all 0's. So you'll have to import your own data and Pokeballs if you want something outside of the standard Pokeball. You will also need to import your own Pokemon as I cleared mine.