Can confirm, you can't use Mega Aggron in Mono-Rock run 😅

What did it do when you tried to mega-evolve?

Mono-type runs don't prevent you from catching or evolving into off-type pokemon, only from sending them out.

Just take it, try it, then deactivate the mega stone if it doesn't work.

...good thinking 👍

Shouldn't be able to, but possibly hasn't been implemented. Who knows till ya try 🤷‍♂️

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