One thing I like about Mai’s clothing is that, intentionally or otherwise from the developers’ part, it have two Johto Pokémon that just happens to gain a new traditional (not exclusive to regional form) cross-gen evolution.
Before Legends: Arceus was released, we easily assumed that Stantler will not be Hisuian judging from her clothing (seen in her right leg), and it’s important since she’s the Warden that take care of Wyrdeer, Stantler’s new evolution. Her main Pokémon, Munchlax, is similar in that it’s an evolutionary expansion to a single-stage Normal-type, in this case a Baby Pokémon for the strong Snorlax.
Little did we knew before Legends: Arceus’ release (or full leaks, depending on if you see them or not), the Ursaring on her right shoulder just happens to foreshadow Ursaluna as well. As Ursaring is servicable on it’s own, it’s not in a dire need of an evolution.
But as Ursaluna proved, even a perfectly servicable first-stage or second-stage Pokémon like Ursaring can become even better with a well-done cross-gen evolution. As to why Ursaluna worked so well, it’s already explained in this thread, but in short answer, it brought back the moon theming through forehead design and the evolution method.
And it just happens to be another pure Normal-type Johto Pokémon who receives an evolution that gives it an additional type, in this case, Ground for Ursaluna as to Psychic for Wyrdeer.
It’s such a nice foreshadowing detail that’s subtle enough to surprise people who would least expect it, myself included. Who knew I ended up liking an Ursaring evolution so much until now?