Hey Stars,
Firstly I want to say that I immensely enjoy your game. XD has always held a special place in my heart and you managed to relight that fire.
Secondly I think the game could really improve from adding friendship berries. Whilst I want to incorporate shadow pokemon into my team I find myself not doing so out of fear that I might end up with a gardevoir with high attack ev's or a gengar with loads of special defense ev's. Having friendship berries could eliminate that restriction. Perhaps you could have the vendor in the outskirt stand sell them rather than his usual Pokemart load of potions, revives and balls.
Your's Sincerely,
Me