If you accidentally pressed "B" while your Pokemon was evolving, all you have to do is level it up again.
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If you stop a Pokemon from evolving, it`ll try to evolve every level after that unless it`s holding an everstone.
To Stop Evolution:Tap the B Button Repeatedly until Evolution stops (While Evolving)Make your Pokemon hold an Everstone (Does not Evolve while Hold)Note: Trading Pokemon that Evolve can not be stopped.
The everstone stops evolving all Pokemon that evolve in the first place.
There are two ways to stop a Pokemon from evolving. The first is to give it an everstone, which prevents you from working everytime the Pokemon is ready to evolve. The second way is to press "B" when the Pokemon is evolving. If you did neither, then your Pokemon is not ready to evolve.
Well, if you are talking about it evolving I know the answer. If you don't want to evolve then press B on the Ds. But once it stops the next level it will evolve again. I hope my answer helped!!! The Pokemon will stop evolving if you give it a everstone.