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A few ideas I have:
>3 stage Frog mon
Water/Dark literal "bull frog."
>3 stage Fighting humanoid
Pure Fighting Power Lifter/Atlas inspired. Dumbells for hands that grow to become a giant boulder that resembles the Earth.
>3 stage pure Psychic humanoid
Kimono girl that evolves into a crazy channeler. Has an ability that allows it to get STAB off of Ghost type moves. Or maybe an Illuminati pyramid.
>2 stage Psychic tapir
Appearance is more in the lines of the actual Baku complete with tusks. Feeds off nighmares now.
>3 stage Ghost
Ghost/Poison Ectoplasm ghost.
>2 stage Water Jellyfish
Water/Steel Portuguese Man O' War. Top half looks like warship.
>2 stage Ground Mole
Ground/Fire Star nose mole. With a shooting star motiff.
>2 stage Equine mon
Water type hippocampus.
>3 stage Rock type
Rock/Normal --> Rock/Dragon Pet Rock with a hatchling motiff in the second stage that becomes the Roc. A mythical giant bird. But give it reptilian elements too.
>Poison type Pollution based mon
Pure Poison Noise Pollution.
>Grass type Mushroom
Grass type Mushroom house that evolves into Prototaxites. The worlds tallest mushroom. Resembles a skyscraper. Maybe Grass/Electric?
>Figting type monster duo
Fighting/Dark Kendo user focuses on Defense
Fighting/Steel Fencer focuses on offense.