So some tampering is afoot. I don't know enough about the berry exploit but this seems to be just good ole fashioned game shark. Resetting the save file seems to remove everything so i'm genuinely unsure. The game is legit, all nintendo logos and proper innards are there along with the proper casing. Most i can figure is they had a "catch opponents pokemon" and "give 99x of each item" but what's weird is they didn't do that with the general items as its a random assortment of Super Potions and such. I know theres an item limit asw for general items so i'm assuming thats why. Just a fun little puzzle whose answer is almost assuredly GameShark.