I don't really use 'em. I have Potions, Hyper Potions, Antidotes, etc. that I find lying around that I use more than the berries. The only time Out might use a berry is when I don't have an antidote and my 'mon got poisoned. I don't grow 'em or even give 'em to my 'mons to hold, there are more useful items that could be held.