It's possible you might be thinking of:
* The Pokemon GO app: This app is all about catching Pokemon in the real world. You can gain happiness with your Pokemon through things like feeding them berries, petting them, and battling with them.
* A fan-created concept: Maybe there's a fan-made app or story that includes the terms you mentioned. If you can give more context, I might be able to help further.
Could you clarify what you're referring to? Do you have any more details about this "Poke Tech App" or "App Happiness"?