For me when I did my grass mono, I hacked in a cradily just for that battle, then released it afterwards. You may have to hack in a pokemon which can help or pick a different type which is easier
You could perhaps go back to a previous save file by going to C drive, users, (your username)file, then saved games, then pokemon rejuvenation. Delete the current game file and rename a previous save: 'Game'.
It would help if natures and held items were also included. What type Silvally is it? and I would suggest ditching dragon pulse if you are going to run a drag move. Also get rid of power trip on Corviknight because it's useless without any stat boosting move, maybe replace it with roost and also get rid of flash cannon since it's not really a special attacker.
C drive, then Users, then your (username)file, then saved games and it should be there. Copy your regular Reborn save and insert it into sandbox save folder, after you are done, move it back
If you have RPG Maker then it's easy to compile the data because you can run the game on it and it will compile everything in the PBS file including the changes you've made and it should take effect - that's how worked for me at least.
Mental disorders take a big toll on your body, especially how we think. I don't have MPD so I can't relate but my personality changes quite often, for reasons i can't control. Usually what I'll do is try to think long and hard about whether I want to be this person, even if it clashes with what my mind tells me. Maybe Therapy could help? - I'm sorry if i couldn't offer much but stay strong.
Pokemon Rejuv:
Gorgeous scenery on Route 2(and music). Nothing major but it's something that I enjoyed about the game.
The battle against Flora(Ryland).
Also when Venam was fully healed from the spring and revived.