Shiranui studied up on Milo.  "It says here that Milo uses the Gossifleur evolution line in his gym battles," he stated after looking up a guide on the Gym Challenge, "Rotom, what's the data on the Gossifleur evolution line?"
"[i]Gossifleur, the Flowering Pokémon.  A Grass type.  It whirls around in the wind while singing a joyous song. This delightful display has charmed many into raising this Pokémon,[/i]" Shiranui's Rotom Phone stated, "[i]Eldegoss, the Cottom Bloom Pokémon.  A Grass type and the evolved form of Gossifleur.  The cotton on the head of this Pokémon can be spun into a glossy, gorgeous yarn—a Galar regional specialty.[/i]  One ability of theirs to watch for is called Cotton Down and there is a probability that one or both of Gym Leader Milo's Pokémon have it."