This is great! I love the vita homebrew community, they really are good at putting stuff out quickly like this, and it looks like it runs really well too.
I preferred to buy used Pokemon games on the DS so I could see what the person who had the game before me got.. and I would just .....you know.. pluck them out and hang on to them for my game.
Is it piracy if it was released for free? Not in my opinion, but I also think it's not piracy if buying it isn't owning it, and it's not piracy if you can't buy it from the original creators anymore.