I would recommend using this.
But if you prefer to do it manually just go to C:\Users\[USERNAME HERE]\Saved Games\Pokemon Reborn and copy the Game.rxdata file to a safe location.
Berserk, Darker than Black, Phantom: Requiem for the Phantom, Claymore, Ergo Proxy... I don't even like this genre, but those animes are just too good to miss out on.
Its not that hard, I have made a video for every Gym. I beat them all using only 1 or 2 pokemon and no items. You can check it out here. If you just get the pokemon I used, or pokemon with a simmilar typing/attacks, and a few random ones you wont have a hard time. Now put in some training + use some potions/revives and it will be a 100% win.
Imagine his Clefable boosting itslef to max def and spdef with only 3 cosmic powers, heals 75% hp with moonlight, and then spams 150 power moonblast to 1 hit most of your team
It is probably one of this 2:
1. Try going to >>More Replay Options<<
or
2. You reached your attachment limit. To fix this go to your profile > edit my profile > manage attachments > and delete the ones you don't need anymore.
If it is not, then please take some pictures of your problem it will be much easier for us to determine what is wrong.