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Professor Oak has discovered that Pokémon can become even stronger by Mega Evolving. Not much is known about this type of evolution. However, we do know that you need a Key Stone to trigger it.
Professor Oak, with the help of Roark, have discovered how to make Pokémon mega evolve. There are a couple things you need to complete on your quest for Megas. First, you need to have put the pieces together and found the Key Stone. Next, you will need to talk to Roark and see if he thinks you are a worthy enough trainer to receive some of the special items he has discovered. If you can prove your worth, you may receive something truly mega!