This is more like an extra mini game for Black 2 and White 2 pokémon games. I bought it for 2 bucks and downloaded some years ago and I still use it sometimes. It's only good for people who are collecting rare stuff, as you can find here some good mons with their Hidden Abilities and in the rare Dream Ball. The best thing is that when you finish this tedious minigame you can catch some great legendary mons in Dream Ball and with Hidden Ability, like Tornadus, Thundurus, Landorus and even Giratina, Lugia, Ho-Oh, Palkia or Dialga... It's so far the only way to get them like that.