Verified answer

Sometimes when you catch Roggenrola they are holding an Everstone which has the ability to stop Pokémon from evolving so if you just take away the everstone everything will be fine :D

This Site Might Help You.

RE:

Why won't my Roggenrola evolve?

So, I have Pokemon White. And I have a Roggenrola that is level 29. I trained it since it was level 13. I have heard it evolves at level 25, but nothing happened. Is this a bug?

For the best answers, search on this site https://shorturl.im/awlcj

Double check to see if it is holding an item. They often show up wild holding an everstone (a held item that will prevent pokemon from evolving.) If that's the case, just take the everstone away and the next level it gains it will evolve.

Check and make sure the Roggenrola you caught was not holding an everstone. It has a good chance of having one when caught. If it does, simply take it away and gain another level. Then it should evolve.

Roggenrola Evolution

Roggenrola have a 50% chance of holding an Everstone, making it unable to evolve. See if yours is holding one.

(My daughter answered this one...)

roggenrola evolve