It depends what game you want him as a tag partner on. If it's yugioh 5ds 2010 version then beat team shooting birds 3 times. Team shooting birds is Yusei and Crow. They can be found in the south part of the Satellite.
The Undertaker's tag-team partner is Kane
he is by the old high way after story mode
the Great Khali doesn't have a tag team partner because he doesn't compete in tag team matches.
Duel someone once and they will ask you if they want to be there partner.To get tag partners in World Championship mode beat someone 10 times (not Turbo Duel) they will ask you to. (Note:If you beat the game go to Satellite Slum and go to the Old Highway.You will see Yusei and Trudge well go to Yusei and ask him to duel. Beat him 10 times and you get him as your Duel Partner and also he will be unlock as a Duel Partner in World Championship mode. Yusei is the best Tag Partner ever,his Deck is Stardust Awakened.)
In Story Mode, you can only have partners who are the individuals of another Tag Team (and Yusei or Akiza). After beating them 10 times (not in a Tag Duel but a regular duel), you'll be able to Tag Duel with them in Story Mode (and World Championship Mode).
the great khalis tag team partner is r-truth.
EDGE
Yes just duel him 10 times (not turbo duel) and he will be unlock as a tag partner in WC mode.If you don't know where he is after you beat story mode go to Satellite Slum and go to the Old Highway Yusei will standing there with Trudge (the guy who's been chasing you).
vikki
Yusei resides in the Satellite section of the Story Mode. He stands next to Crow Hogan, who is also his Tag Partner should you wish to Tag Duel them. They are both next to the Old Highway. You may also Duel Yusei in the World Championship Mode by choosing him in CPU Duel. Note that you can only Turbo Duel him in the Story Mode; that option is not available in the World Championship Mode.
jim neidhart
kelly kelly