One Cool Dude

First things first, make sure Yamcha isn't in your party. This substory pops up during Intermission 2. You'll find Puar hanging out right in front of the Capsule Corporation building in West City.

Chat with Puar. She'll tell you Yamcha's been going on a lot of dates and she's a bit worried, so she wants you to go check on him.

Yamcha is located on the road just northeast of West City. Make your way over there.

When you arrive, you'll see Yamcha on a date, but then another girl shows up, and things start to get a little chaotic. The girls will summon some robots to deal with Yamcha's… let's call it 'flirtatious' behavior.

You'll need to jump in and help out by fighting these robots. Don't worry, they're the same type you've likely encountered before, so just use your usual tactics.

Once you've won the fight, the substory will be complete!