Yes

Ash walked over to Lugia, who blushed madly. "My chosen one...m-my chosen mate..." Lugia said nervously.

Ash smiled and brought down Lugia's head, kissing his beak like maw. Ash felt his penis shrink away, leaving a moist, heated vagina of a Lugia. Ash took off her clothes, just as her D cup breasts grew in, leading Arceus to teleport them to Lugiia's home, before each legendary left with their own mate, ready to quench the female partner's heat.

Lugia stared in disbelief and sexual pleasure as the boy who was his chosen one became a beautiful ____ Lugia.