Just to clarify the terms used in my variable/switch naming. Slot 1/2/3 = Person who occupies the first position in the party. EN1/2/3/4/5 = Enemy.
This would be the event that runs when you touch a monster for basic enemy setup. (I have it so the battle takes place on a different map. So you would probably not need any transition stuff)
(https://rmrk.net/proxy.php?request=http%3A%2F%2Fi44.tinypic.com%2Fjgh2tk.png&hash=dd55709642cb4e6d576d119c673d37c05ac17735)
I have this event run once the player is on the battle map to setup the HUD.
(https://rmrk.net/proxy.php?request=http%3A%2F%2Fi40.tinypic.com%2Fqnmsec.png&hash=dc565713eeef522edb8bf5d35742d29c8e5b63ea)
Then finally it'll call the common event I have that is the main battle flow. This is repeated until a victory condition is achieved (or game over).
(https://rmrk.net/proxy.php?request=http%3A%2F%2Fi39.tinypic.com%2Frud4iq.png&hash=ed4d280b7b1563e2934e4084ce0c613a3a545695)