Originally Posted by Fat magic9mushroom
In RBY OU, are OHKO moves banned? Additionally, are freezing moves banned if there is an opposing frozen pokemon?
OHKO moves are banned.
Freezing moves are NOT banned if a frozen Pokemon is frozen, you can still use Ice Beam if you freeze something. This is typically handled by "Freeze Clause", which is a rule built-in to simulators and Pokemon Stadium that prevents more than one Pokemon from being frozen.
If you're doing this in-cart and somebody gets multiple freezes with Ice Beam (since it's kind of unreasonable to ban the use of Ice moves when something freezes), the way to handle it would probably be by calling the game if it's obviously in one player's favor before the freeze, or simply starting a new match if the result is up in the air. You can't just switch around until something thaws because that doesn't happen in RBY.