I usually rush forward and dodge and defend as it counts down to when you are in close enough proximity to face him. I tried using several subweapons and I think decoy works ok, but the subweapon gauge runs low very quick due to defending missle attacks. I try to defend his series of attacks, but his final attack(when he glows red) breaks my shield and considerally limits the amount of time and damage I can inflict. Any help?

my strategy is to first equip Mummy. dash forward, to close the gap faster (when you unlock 0 Shift, it makes it much easier). when he fires that burst attack, use Mummy. the shield will block about anything, including that, and it drains the sub gauge at a pretty slow rate. if you time it right, it only goes down one time, which should leave you with plenty for the fight. once your in-close, block his initial attacks, then let him have it with the sword. if you can catch him between flurries, use a burst sword attack, then when he's sent back, dash after him and slice him up.
you should also be able to mess him up bad if you give him a volley of Phalanx, Halberd or Gauntlet in close. Geyser should also work.
i haven't tried this one, but you might try throwing a Floating Mine (deploy it, switch to Grab and throw it like you would an enemy) at him from a bit of distance.