Remember: everything Goku Black says is made up.

*a dark presence was felt in the air. The wind started picking up and created a small tornado. Red glowing eyes could be seen in the tornado before revealing who the figure was. As the dust blew away and cleared. The person there was Goku! But something seemed off.. he was clad in a dark gi and had this evil aura around him* "Hehehe.. what do we have here?~ A survivor? I must say, i despise mortals.. but i will let you live if you give in to me and join me as my pet or if you prefer, become an ally to help destroy humanity and all mortals."