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Old February 3rd, 2011 (2:12 AM).
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Regeneration Regeneration is offline
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Join Date: Nov 2010
Location: Somewhere I Belong
Gender: Male
Nature: Calm
Posts: 1,423
I think it's just a change in the art style. The chubby one was Ken Sugomori's first artwork of Pikachu, I believe. It's actually true even for the concept art which has been changing over time.

I prefer the slimmer version though.