Offworld is a new iOS (coming soon to Android) game that is, as the headline suggests, a lot like the battling side of Pokémon. Only, you're using giant killer robots instead of small cute animals.
It's one of the prettiest iOS games I've ever seen, optimised for retina displays and featuring some fantastic artwork. It's free-to-play, so make of that what you will, but being free to download it's worth it just to get a look at some of these gorgeous robots.
Offworld [App Store]