Mega Evolution

A mechanic from Generation 6 Pokémon X/Y games, this feature was released on PFQ on November 21st, 2013.
When you have the Mega Ring, you'll also get a random Mega Stone from Professor Holly and a section at the Merchant's will become available.

Mega Stones

A Mega Stone is a special item needed for Mega Evolution. Each Mega Stone is specific and can only Mega Evolve a certain Pokémon. The stone contains the name of the Pokémon it can evolve in its name and summary. After Mega Evolving a Pokémon, the stone will break. You can buy Mega Stones from the Black Market.

How to Mega-Evolve a Pokémon

Visit Doug the Merchant with a Mega Ring. The last section, Mega Evolution, has a link to said page. Once there, you'll see a list of Pokémon in your Party. If you only have Eggs, it will tell you that there are no Pokémon. Select the Pokémon you wish to Mega Evolve. A warning shows that the Mega Stone will break in the process. Next, you can choose how long the Mega Evolution will last.

• 7 days = Credits
• 28 Days = Credits
• Forever = GP

Redeem a Voucher

If you have at least one Mega Stone Voucher, a new tab under 'Mega Evolution!' will be displayed, along with all the vouchers that you have in your inventory. To redeem a voucher, click on it. A button will appear in the tab for confirmation.