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Heatran. It is the only Pokémon that I still haven't been able to come to terms with its appearance yet. I get that it's supposed to be molten rock extruding from the Earth's core, ringed by cooling, rare stones and metals, but the design just seems so... non-commital. It actually lacks detail in my opinion – it could really use some more defining features, because something about the vagueness of its shape and the simplicity of its rocky parts just lacks that degree of "iconicity" for me. And I despise its colouring: the semi-molten parts rising up to the surface look badly finger-painted on, completely lacking pattern, gradient, and movement, and feels dissonant to the design and colouring æsthetic of every other Pokémon. It looks derpy in a bad way, and lacks a feeling of even a subtle, suppressed geological power. It's the only Pokémon (mostly due to its singular, odd colouring choice) that looks "wrong" to me; it either needs to be more or less simplistic, more or less weird, more or less "edgy," because right now its in this not-quite-enough-in-any-direction limbo that just falls completely flat to me.
Special mention could also go to Hydreigon, simply because once I heard that it was originally supposed to be a tank dragon, I wished they had either stuck with that concept, or better-purged/reinterpreted those elements from its design, because in retrospect it then looks a bit mid-tweak and unfinished to me (like the stripes on its belly –either make them tank treads, or integrate the striping into the rest of the design, because right now it's just this underwhelming not-particularly-jesterish blob pattern-body).
I also think the vast majority of Gen V's English names are amateurish and awkward compared to the preceding generations' interpretations and puns. I still love Gen V, though, can't wait for Gen VI, looking interesting.