This level seems standard, but will stop you every so often in order to capture the Pokémon in a minecart going over a rainbow

Bronze Medal Requirements:
Investigate the area and find the illusive Pokémon; Ho-Oh

Silver Medal Requirements:
Capture Ho-Oh at Level 70

Gold Medal Requirements:
Capture Ho-Oh at Level 100

Ho-Oh is the boss of this level. When it arrives, it will start attacking by sending pillars of fire out at you. They move quickly so you have to act very quickly in order to defeat them.

Level 50
Ho-Oh unleashes five waves before capture

Level 70
Ho-Oh unleashes five waves including horizontal, vertical and diagonal flames

Level 100
Ho-Oh unleashes sevent waves including horizontal, vertical and diagonal flames with the characters representing them being nowhere near eachother