From the Super Mario Wiki
Rodeo Bobsleigh is an item found in Sparkleton in Mario & Sonic at the Olympic Winter Games, in the Adventure mode of the DS version. In order to get it, Mario has to enter a certain Warp Pipe to reach the area where the chest is. This item allows Mario and Sonic the Hedgehog to access Bobsleigh missions and is necessary to challenge Wario and Waluigi for the first time.
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