6 Sabo Was Introduced After Ace's Death In The Story
While Luffy remembered his time with Ace and Sabo in a flashback, fans got their first look at Sabo's character, what drove him to pursue freedom, and what his bond with Luffy and Ace was like.
What episode does Sabo appear in?
One Piece Episode 662 - SABO'S APPEARANCE AT DRESSROSA - YouTube.
What arc does Sabo appear?
He acts as an ally of Luffy during the Dressrosa Arc, as well as the movies One Piece Film: Gold and One Piece: Stampede.
