I'm not sure if you were planning on throwing a money system into the game, as far as player-player goes, but if you are, an auction house to put up rare items/Pokemon would be pretty cool to be able to go on and fine exactly the Pokemon you've been looking for
![Cheesy :D](http://www.pokemon-universe.com/Smileys/default/cheesy.gif)
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my simple idea yours to do what you will with,
Athuma