How do you get jinpachi on tekken 5 dark resurrection?

You can't get Jinpachi in Tekken 5: Dark Resurrection. He's not a playable character in that game.

While Jinpachi is a crucial part of the Tekken storyline and appears in the story mode of Tekken 5, he's not playable.

You can play as Jinpachi in later Tekken games, like Tekken 6 and Tekken 7.