Who's that Pokémon? (Poetry Edition)

[Baegal]

I can't swim well like all fish should,
and I'm active as a boulder.
I may seem useless and not all good,
but just you wait 'til I get older!
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I can tell what you dream with a whiff of my nose,
then eat them with ease, and nobody knows!
Good dreams taste good, fun dreams taste best,
but bad dreams? no way! Those things are a pest!