Required: Super Boots or Ultra Boots

After the Shy Guys arrive, talk to Merlon, make sure he stands outside, after the conversation go to Dry Dry Outpost and walk circles around the palm tree, if you did that long enough a toad talks to you. next, go to toad town and finnaly to merlons house with a spinning roof, inside the house: make a A + A Jump 3 times in a row and a badge will fall out the sky wich is called the Quick Change Badge.

Note: If the badge is on. you can switch from partner to partner without losing a turn in a battle.