That is episode 9 and he already has it.
Have you renamed them?
Here is a quick guide how to do it.
1. Go to your reborn folder>graphics>battlers.
2. There, cut out all the front and back sprites of all the pokemon, and back them up somewhere. I would not touch the eggs and stuff.
3. Copy your animated sprites into the folder.
4. Rename them to be named exactly like the unanimated sprites. (for example Mewtwo frontsprite is named "150", back "150b" and for shinies "150s" and "150sb") you will have to do that for every pokemon.
5. Start the game and enjoy the crashes