It stores flammable gas in its body and uses it to generate heat. The yellow sections on its belly get particularly hot. (Sizzlipede)
It spits out thread imbued with a frigid sort of energy and uses it to tie its body to branches, disguising itself as an icicle while it sleeps. (Snom)
It whirls around in the wind while singing a joyous song. This delightful display has charmed many into raising this Pokémon. (Gossifleur)