Hint: XP Plateau
You'll need a third party controller with turbo or auto-function. Stand far away from an enemy s er so you don't destroy it with weapons.
Then just simply put a piece of tape or a weight on the b*tton for the SLASH attack and start grabbing XP.
Auto-function controllers can be set to attack naturally (if the function is available).

ive checked 10 different cheat sites out & the above tip is repeated on all sites with no other cheats or tips for the game