Milotic is a serpentine Water-type Pokemon that has the abilities Marvel Scale, Competitive, or the hidden ability Cute Charm. It evolves from Feebas when traded with a Prism Scale, which can be randomly acquired from the meals at New Sushi Stick located in the Anthian City shopping district. Be mindful as each helping of sushi costs $5,000.
Symbol aide aside, Milotic's gender can be visually identified by the length of their "eyebrows". Males have shorter ones that extend to about 2/3rd's of the way to the ground, whereas the ones of the females extend much further, just about touching the surface they're on.
These differences are made further evident on the shiny variants, with males having a light-blue coloration inset on their golden tails, and the females having an orange coloration by comparison.