If you have played previous entries in the Persona series, then you will know that the dungeon areas of the game have a variety of rare monsters hidden in their depths. (videogamesuncovered.com)
However, you can also take your team online to do battle with other players and trade for rare monsters. (gameological.com)
In it, you'll explore an ancient factory with a lot of randomly generated levels, fight rare monsters and avoid all kinds of traps. (blg-publishing.com)