I don't play particularly ballsily; I don't feel I have to. My team's mostly walls and most cannot be OHKO'd by anything off the bat. As well, I tailored their movesets to be unpredictable so I don't have to be.
For example, I'll send Slowbro in on Forry, Metagross or Skarm. Unless they know I'm packing Flamethrower, they're not going to switch, and I don't have to predict.
If they DO know I have Flamethrower they probably WILL switch and I'll CM up instead. If they don't, no big loss, since Slowbro takes 40% from CB Metagross T-punch and can Slack Off.