As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Oshawott and Piplup:
Oshawott: The scalchop on its stomach isn’t just used for battle—it can be used to break open hard berries as well. It fights using the scalchop on its stomach. In response to an attack, it retaliates immediately by slashing.
Piplup: It doesn’t like to be taken care of. It’s difficult to bond with since it won’t listen to its Trainer. Because it is very proud, it hates accepting food from people. Its thick down guards it from cold.
Source: The Pokémon Company
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