While everywhere juggle with ex decide and using that raw to confirm any aa/a2a is nice, remember that you can do so much more from a counter air cd. Here are two combos that i want to start using when i land that counter air cd for 2 stock, one drive:
Mid screen: CH j.cd, dash forward,

xx ex decide,

>

,

tackle, super. Little less than 500 dmg iirc
For easy confirm simply dash after landing from the cd. Most of the time you'll have enough time to dash before an ex decide if you didn't CH anyway, plus it's not a bad idea to get closer before spending the meter. You'll want to try to hit with the top of the sweep. If you are close you can go for another j.cd instead of the sweep for more damage, but the sweep variation works at farther distances.
Corner: CH j.cd,

tackle [DC] ex tackle, j.cd, ex decide,

>

,

tackle. A little more than 500.
Easier, and more damage. Just make sure the first tackle hits them low to the ground and you're all set.
Also, who knows how to beat billy with her, because i'm convinced it's impossible.