Dash behind the big rock and spam strike raid until he ded
I ended up cheesing it. Not with Strike Raid, but with Ventus you can use Tornado and it'll take off half his health bar if done right.
I'm watching the Re:coded movie right now. They forgot to correct Sora's lipsync at the intro when he talks to Namine, which is hilarious.
EDIT: I finished it, oh GOD that was SO BORING. It was more boring than Days's movie. I know it probably wasn't meant to be watched in one sitting, but jesus. I know Days's movie skipped over a few important details, but Coded is almost completely unabridged. They could've trimmed out a LOT of unnecessary crap.