Use the usual strategy for this battle, ie: 1 party member assigned as curer, one as attacker and one for set-up and attack. The curer can be anyone, but Selphie and Quistis are good, because their Limit Breaks Full-Cure and White Wind respectively are very useful in this battle, so try and include at least one of them in your party. For more information about Limit Breaks, click here. For attacker, choose someone with a high Str stat, such as Zell. For set-up and attack, use Squall. Make sure he has some of the following spells: Double and/or Triple, Regen, Haste, Protect. Cast Triple on Squall (or Double, if you don't have any Triple spells). Then, have Squall cast Regen, Haste and Protect on all your party. All the while have your attacker attacking, while you are setting-up your party. The curer can attack too, when there is no-one to cure. Just keep pummelling the Mobile Type 8 with physical attacks, magic (use your Guardian Forces as little as possible now... by this point in the game you should be strong enough to get by with using Guardian Forces solely for junctioning, and not for using in battle). Use Limit Breaks also. Be sure to Mug a Laser Cannon (important for obtaining Pulse Ammo for use in re-modelling to the LionHeart for Squall. For more information