From Bulbapedia, the community-driven Pokémon encyclopedia.
Fiery Furnace (Japanese: ほのおのようこうろ Fiery Furnace) is the fourth level in Pokémon Rumble. Its bosses are mostly Fire-type. The Pokémon found here are often Fire, Steel, Fighting, and Electric-type.
Most of the Pokémon in Advanced Mode are Fire and Electric-type in this level.