List of Ranges
From The Bakugan Wiki
Close
Close was when two battling Bakugan, are moved to the closest position. Most powerful Subterra attacks are boosted at close range, and Darkus abilities like "Antimatter Burst" will activate, and become usable at "Close" range.
Middle
Middle was the automatic default, when entering battle. Unlike "Close" and "Far", "Middle" has the most moves to it.
Far
Far was a range, that doesn't have a lot of moves to it, so it protects you from most attacks, but it prevents you from attacking your opponent, unless you have moves like, "Far Reach" or "Solemn Night" that cover all ranges.