Sham
The Guardian of Ruin and Birth
Idk the summary still says " Iris had set off on a training journey together with her partner Pokémon Axew, aiming to become Dragon Master, but it appears she has now returned to the Unova region" so I'm assuming not but it could just be past tense prior to this episode.So she must be a dragon master now
Tbh I'd kinda still give it to Dawn because she was literally a sliver away from her goal. Unless being a champion does mean she became a dragon master