Who do you have to duel get locater cards in Yu-Gi-Oh sacred cards?

You don't need to duel anyone to get Locator Cards in Yu-Gi-Oh! Sacred Cards.

Locator Cards are obtained by:

* Opening booster packs: These cards are found in booster packs, similar to other cards in the game.

* Trading with other players: You can trade for Locator Cards with other players who have them.

There's no specific duel or opponent that will grant you Locator Cards. They are part of the standard card pool and can be obtained through the usual means.