Undiscovered Pokemon

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Each generation of pokemon is said to be new and previously undiscovered, but for the most part, they seem to have just been running around in the open. With how powerful some pokemon can be, it would stand to reason that many pokemon are undiscovered simply because they are too good at remaining unseen.
>Ghost types which are actually invisible
>Ground types which tunnel for miles beneath the Earth's surface and never see the light of day.
>Grass types which can seamlessly blend into foliage, the only evidence of their existence being the occasional missing persons report.
>Psychic types which manage to keep their entire existence a secret, rearranging minds and running experiments as they see fit.
What would the cryptids of the pokemon world be?