Shows up in the Party Plaza after completing the Salty Sea section (world 5) of Challenge Road. You have to unlock all the minigames before unlocking Pom Pom.
About Pom Pom
Pom Pom is a boss who debuted in Super Mario 3D Land, where she appears as the boss of various airships. She appears to be both the female counterpart and partner of Boom Boom, and is often seen wielding a shuriken with a ribbon on it.
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Unlock other Characters
How To Unlock
You have to complete the Chestnut Forest section (world 2) of Challenge Road to unlock Diddy Kong.
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Appear randomly after playing different modes Dry Bones is weird. There doesn’t appear to be a set requirement for unlocking the skeletal Koopa. Dry Bones just shows up in Party Plaza after playing for a bit. You’ll find him at the top of the plaza.
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To unlock Donkey Kong, play River Survival three times. Make sure to take different paths each time. On the third time through, you’ll see DK in the crowd as you head into the home stretch.
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Coins Numbers with “-” or “+” indicate a dice roll that will cause either a loss of coins “-5” or a gain in coins “+5”.
Character Dice Roll Plain Numbers indicate the number of spaces you will move on the map.