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I don't think we've had any whale shark Pokemon, huh?
It could follow a similar pattern with Gyarados (evolving from something pathetic to being badass), or Milotic (evolving from something ugly to being beautiful). It could evolve from something very tiny to being gigantic.
I even made a Fire Triceratops awhile back, having been inspired from another person's own Triceratops Fakemon.