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Lots of the Pokemon in gen 3 felt plain bizarre to look at due to the radical shift in design philosophy around then, but Nosepass took the cake due to its misleading sprite.
You're battling Roxanne and yawning at her unoriginal Geodude, but then she suddenly sends out this unsettling disembodied head that looks nothing like any other Pokemon that you've seen up until then. At that point, you truly realize that Hoenn is a completely new generation of Pokemon.