As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Psyduck:
Did you know? Using psychokinesis gives it a headache, so it normally passes the time spacing out and doing as little as possible. It has been found that its brain cells are 10 times more active when Psyduck is experiencing a headache.
Source: The Pokémon Company
Source:Pokémon