Opponent Mega Evolves his Charizard into Mega Charizard Y, then Solar Beam on the Rotom
Rotom lives the hit and uses Volt Switch, goes to Metagross
Turn 2
Metagross Mega Evolves and uses Pursuit on the Mega Charizard Y, who decides to stay in and lives the hit
Mega Charizard Y goes for Fire Blast, KOing Mega Metagross.
Afterwards, the Metagross player is left with exactly two options: Skip turn, and Skip to end. Both buttons do absolutely nothing and the room is stuck. In other words, this is a game-breaking bug.
This is something my choice refactor will eventually fix, but I don't see a need to keep this issue open since there's not really enough information in this issue to do anything with.
http://replay.pokemonshowdown.com/gen7pokebankou-494453294
What happens is the following:
Afterwards, the Metagross player is left with exactly two options: Skip turn, and Skip to end. Both buttons do absolutely nothing and the room is stuck. In other words, this is a game-breaking bug.