It's not even Dunsparce, evolution is not a Farfetch'd idea. Its not subject to Bayleef or Diggersby, it is to Roselia. Level and Stone evolution is the same thing the only difference is EXP.
[spoiler]Link to the post I parodied:
https://www.bungie.net/en/Forum/Post/107577798/0/0[/spoiler]
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Actually Pokemon is an invalid example of evolution as a single organism is unable to evolve, populations evolve over a long period of time