Miraidon is an Electric & Dragon type, is the box legendary of Pokemon Violet, and has a fairly good design. I definitely love its design more than I do design of Koraidon, but when it comes to shiny, I don't like it as much as I like Koraidon's shiny. Miraidon is obviously great to use in battle, with it having solid stats, a great ability in Hadron Engine that sets up Electric Terrain, and a fairly good movepool. Overall, Miraidon is definitely a great pokemon, and I enjoyed growing attached to it via riding and titan storyline with feeding it sandwiches throughout my Violet playthrough, but I just love the other 12 too much to rank Miraidon higher than them, which is why it ended up here.
Pokemon Left:
Meowscarada
Skeledirge
Quaquaval
Armarouge
Ceruledge
Annihilape
Clodsire
Kinggambit
Great Tusk
Flutter Mane
Chien-Pao
Iron Valiant