As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Lapras:
Did you know? A smart and kindhearted Pokémon, it glides across the surface of the sea while its beautiful song echoes around it. Crossing icy seas is no issue for this cold-resistant Pokémon. Its smooth skin is a little cool to the touch.
Source: The Pokémon Company