This level has you travel through a mansion in order to get to the end. Enroute, you need to hit symbols to keep the mansion illuminated. You also need to bring up enough points to get a Pokémon to drop a key.

Bronze Medal Requirements:
Get to the end of the level, finding the key by capturing Pokémon and capture the Rotom at the end

Silver Medal Requirements:
Capture three of Rotom's forms. Has to be done over multiple runthroughs

Gold Medal Requirements:
Capture all six of Rotom's forms. Has to be done over multiple runthroughs