After winning 16 badges Dandy Rick will ask you for more fuel for his car. You need to craft and give him a Dark Matter Ball to help him out. You can look up the crafting recipes for a Dark Matter Ball here. It requires that you craft a Dark Energy Ball first.
In the second-to-last side quest in v.1.o of the game Dandy Rick will ask you to craft him a new car battery. You can help him by crafting and giving him a Microverse Battery. This will allow you to complete the Dude, Where's My Rick side quest.