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Going off deep-sea themes, I like the idea of a Lapras evolution (via an item like a Reaper Cloth) that would turn it into a globster-esque creature, like in this photo.
This picture was taken by Japanese fishermen in 1977 and superficially resembles a plesiosaur carcass. Since Lapras was inspired by the Loch Ness Monster, it seems fitting to have a similar related cryptozoological phenomenon attached to anything else relating to Lapras.
The type would be Water/Ghost.