I've had this idea to try and make a pbta game based on Pokemon. Not sure what stats or moves would be, but I liked the idea of defining Pokemon through tags. Like for example Bulbasaur could be [Grass][Poison][Small], or maybe more specific like [Vines]. I like this because its easy to define existing Pokemon or make up your own. Growth of the Pokemon could be changing and/or adding new tags.
In theory the game would be about exploring, finding new Pokemon, and creative problem solving using Pokemon abilities, moreso than battling.