First of all, make the more expencive berrys do something, let all the items do something like if you buy the tv, it will give you news quicker than anywhere else on the forum, and it may give you links to secret places on the forum where you can play games and win money and stuff
Make more items, we dont have enough items. More Tm's and Hm's are needed
You have slots, why dont you have a roulette too
Slot machine, add more reels and make it less easy to win so much
Instead of 24 hours waiting to battle, make it 12 hours, or at least double the amount of play. I am sure the server can take it, since they isn't many members here to battle just yet. When they are more members, then lower the amount of battles you can do in that 12 hours
They are other berrys, past hozu berry, so you should add them at a high price (If you need images i can provide them for you)
I have plenty more ideas where those came from, and i want to help out in any way i can, so i will host any images that you might want so you can free up some space from your host, and my host allows unlimited bandwidth, so gimme all u got

Also if you need any help building any of these new things, let me know and i would be happy to help ^_^