If you go first in round 1, look at your line up, look at the opponents line up. check if they have a SOB+SOA, see if your damage on your line up is really bad, like if you have Redra, Sasha, and Danae or something. this would indicate that Greem is pretty key fory out to win. If you have a chiara, a mandred and a Michael, then throw Greem out with 1 pill or something. cause you dont really need that poison to win.
something along those lines. its kind of a hit or miss. i usually just send her out with 4 pills