Its singing voice is its chief weapon in battle. This Pokémon’s Trainer must prioritize the daily maintenance of its throat at all costs.
– Pokémon Moon Pokédex
Primarina is the fully evolved starter of gen 7. Its typing of Water/Fairy is only shared with Marill, Azumarill, and Tapu Fini. Its design is rather feminine, and the Ultra Moon Pokedex calls it a “songstress”, despite it being a mostly male species.
I used Primarina as my starter for Ultra Sun. It was pretty useful as a tank.
Stat-wise it has good Sp Def and Sp Atk. It has a signature move in Sparkling Aria, which turns into Oceanic Operetta (a 195 base power water type move) with Primarium Z.
(I’m posting Primarina today because it reminds me of Azura from Fire Emblem Fates, and today is her birthday)