I was playing a game at a local league, where a Glaceon-GX was on my bench, and an Alolan Ninetales was active. My opponent used a Steam Up, and then Guzma'd up my Glaceon-GX, and the attacked with Ho-Oh-GX. Me and my opponent couldn't decide if that Steam Up was blocked by Glaceon-GX's ability. Would like to hear a ruling on this.