in brazil rain
I think there's a bug involving Leech Seed and Roar/Whirlwind. In this battle: http://replay.pokemonshowdown.com/gen2uu-417081635, on turn 17 Jumpluff went for Leech Seed and then Blastoise Roared it out. But before Jumpluff was Roared out both poison and Leech Seed's damage were applied. Shouldn't it happen only after the target is roared out? Which means the incoming Pokemon should receive the sapped HP.
EDIT: nevermind you are right, the sapped HP should be on the incoming mon (the poison damage is intended though). It's indeed a bug.