If you stop a Pokemon from evolving, it`ll try to evolve every level after that unless it`s holding an everstone.
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You can't evolve Yanma in Leafgreen. This is because Leafgreen was made before Yanmega was made. So basically in Leafgreen, Yanma is a Pokemon that can't evolve.
For exampel I hade a Feraligatr that was over level 30 (Feraligatr evelves from Croconaw at that level). First I didn't want it to evolve, but later, when it was on a lot higher level and I wanted it to become Feraligatr, I just made it grow another level and it evolved. A pokemon that still can evolve and is above the level it evolves on will try to evolve everytime it grows a level if you push B when it evolves (by doing this your pokemon doesn't evolve).
No, Mew NEVER evolves into Mewtwo, Mewtwo is just a man made clone of Mew.
It took me 6 kelpsys and 1 wiki (pokeblocks made in lilycove)
Darkrais evolution. team fusion had captured darkrai and forced him to evolve and made him much stronger ( like mewtwo). he is not in the pokedex because he is not a real pokemon but you can catch him in pokemon vortex