[Bug Report] Brok's Ninetales discard Steelix when they poison him

Zubat used Poison Spray
Brock’s Ninetales (G2 3) is no longer poisoned
Steelix is now poisoned
Steelix (N1 15) is no longer poisoned
Steelix (N1 15) was discarded
Brock’s Ninetales is now poisoned

Please use the in-game bug report feature next time. There is not enough information to know if this is a bug. If it was a game in the “Modified Format 2002-2003” format then there is no bug at all.