Or sex kick. Sex kick actually works quite nicely, especially with the inverse knockback that Doc has.
Against Flaco, there are really only 2 things that you need to do, in general. First, you have to properly DI those drill shine/pillar pressure combos. DI'ing the shine is actually a relatively easy thing to do if you set your mind to it; most of Flaco's drillshine combos are very predictable and straightforward. Anticipating them shouldn't be an issue. You can also DI the drill, and possibly tech it as well, provided that your % is high enough. Proper DI goes a long way in ameliorating the amount of damage the Flaco inflicts through his drillshine crap.
Second, you need to respond properly to the lasers. Again, Flaco's SHB rushdown is very linear and very predictable, for the most part. The Flaco will usually SHB until he gets into jab/grab/smash range--at that point, when the laser stuns you, he's close enough to take advantage of the stun and pull off whatever attack he has in mind. The trick is to look for the laser that comes JUST BEFORE Flaco's attack/jab/grab/etc. If you do that, there's a pretty big chance that you can avoid his follow-up since there's no stun to take advantage of, since you avoided the laser. Do whatever you can to avoid that last laser (jump, shield, roll, spot-dodge, attack, whatever).
Those 2 things are the key to beating Flaco. Of course, you have other Doc-related essentials like u-throw chaingrabbing, decent edgeguarding, and the like, but proper DI of shine combos and avoiding that last laser during his SHB rushdown is the most important.
