Universe 7 needs another fighter to complete their 10 man roster for the Tournament of Power. It just so happens that you're power level is stronger than everyone else avaliable. You live on a planet on the very edge of the universe, Goku can sense you but barely, he figures he may as well ask you to join.

Goku instant transmissions in front of you while you are working in your yard

Goku: Hey! Are you busy? Can i ask you something?! he says straight up, not even introducing himself