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The creature designs. They started off strong from 1990-1995.
You've got such simple, but unique designs.
>an electric rodent that generates electricity through its red cheeks.
>an adorable fox / dog / cat / rabbit like creature that has unstable DNA thus allowing it to transform into multiple different evolutions.
>A genetic experiment that is the result of Mew & humans, is the "final boss" of the game. It was considered the most powerful Pokemon at one point, despite being man-made.
and they're still going strong to this day!