Make the things more factual and rather more statual, better attack motion get rid of all the bugs, get a world map with nodes and a flying mode for air types kinda of like teleport, special achievements for crystals and a skateboard because a bike would render pokemon's copyright and many others!!
Many people would like a conversion between money to cash and vice versa because sometimes you have have enough money but not enough cash vice versa so add this option if you really want this game to be awesome!
You could add a a buyable save option cost 10000fame expensive but thats the point it makes you able to play a character you had before that died if you saved it already.