Where in the world did a Pokemon being small and cute stop it from being a formidable opponent in the anime?Well, it so happens not. There will be much stronger opponents in Hyper Class, so Piplup will be unnecessary for him. I think it is not for nothing that all of his traps in Journeys (so far) can no longer evolve, or only have one evolutionary form.
Piplup will be a Koharu Pokémon rather
Also somebody on his team needs to eat up screen time now that most of them have evolved and become irrelevant