-The storyline is as of Handhelds
-No, it's not once you just see them (by battling or by interacting with overworld pokes) you can obtain their location
-Yes you have to trade for trade evolutions
-Same map no parallel world
Just explore the game and you will get the hang of controls and as Xhaj said we are in testing phase so if you find any bugs do report us and Welcome to the game :)