I was watching a battle of my buddy playing 4th gen, and there was a bizarre glitch where Toxic and Sandstorm did an ass load more than it was supposed to instead of doing the desired 18.75%. I don't have the log, but I have the replay of another match where he showed me the replay of it happening again. Aesoft's replay was bugged (and the problem happened on turn 9, but there was a huge glitch in the program on turn 11).
http://pokemon.aesoft.org/replay-Neil-Perry-vs-Cote1616--2011-12-04
http://pokemon.aesoft.org/replay-Neil-Perry-vs-Cote1616--2011-12-04