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 Evolution allows some fully-evolved Pokémon that are holding a certain Mega Stone to evolve once more. This evolution can either be temporary or permanent.
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.
Mega Ring
The Mega Ring is a special Key Item that is the second component in unlocking Mega Evolution. It is the default Key Stone accessory, and can be swapped out at the Merchant. Unlike other Key Items which can be bought in the shop, the Mega Ring can only be unlocked by completing a special task. <spoiler show="Spoiler - Task" hide="Hide spoiler">Evolve Pokémon a total of 50 times or more, then visit Professor Holly.</spoiler>
Mega Accessories
After one obtains the Mega Ring, one can swap it out for another of the Mega Accessories. The accessories you can change to is dependent on how many times one has evolved a Pokémon. The Mega Accessories are as follows:
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.
- 30 Days = Credits
- Forever = GP
The higher the tier, the more expensive the cost will be both in credits and Gold Poké.
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. There are two types of vouchers you can redeem : the Basic Voucher and the Plus Voucher. The Basic Voucher does not let you choose which Mega Stone you will receive, but instead chooses a random Mega Stone from the tier in the name of the voucher. The Plus Voucher allows you to choose any Mega Stone from a certain tier.