So far, it seems pretty interesting, you get to raise your Pokemon and that, but you don't get to catch them out in the Field. Instead, you are either A) Given an egg to raise or B) Catch it in Safari Zone. Other than that, it's similar to a game called Yu-gi-oh! BAM where you can just leave it closed for a while, then come back, and either A) You gain progress or B) You can leave where you left off.
If you are interested to try it, feel free.