Formations for Bahamut Lagoon. For example. If you place an entire Formation of Heavy Armor's, then you will be able to move less spaces on the battlefield. To speed them up, add in one Light Armor unit, or more.

If you place a Formation fll of Sorcerors, or Wizards, then you're overall magic for casting long range directly from the battle field will be greater.

Also, if you have 2 Mini-Devils in you're group, their rate of success for Dance is greater.

The alternative to making your own Formations, is just select Auto-Formation. But, with your own Formations you can create a much more deadly Party, or a very bad party.