Iris has become a Dragon Master in the end. THis is Unova, and the only strong Dragon Trainer, which is already called a Dragon Master is Drayden. If Iris beats Drayden and takes the only Unovian Dragon-type Gym, they can call her a full-fledged Dragon Master!
Similarly, we haven't got any Seismitoad/Gigalith/Simisage (for more than a single episode). They can pull off such evolutions, if needed.
ALSO, all of Ash's Fire-types (minus Quilava) have reached their final form. They should definitely give him an Emboar, even that late.