So obviously you'll be using WSG to get max damage. You want to push to about 1-1.5 cards on his first wiggle right as the fight starts, then turn around and throw spam as much damage into him as possible. Use all EX attacks and everything. If don't correctly, you do enough damage to skip his second phase which causes the fight to freeze and you just have to dodge the balloons/rollercoaster for the rest of the fight while spamming into him in the middle.

Here's a video showing how to do it. :)