If you're wondering what size binder you will need for a Mega Evolution Master Set with no cards stacked on top of eachother, we recommend a 9-pocket binder with 360 pockets.

Here's a confirmed breakdown of the Mega Evolution set:

• 85 Numbered Base Cards

• 85 Reverse Holo Base Cards

• 8 EX Cards

• 13 Illustration Rares

• 17 Full Arts

• 5 Special Illustration Rares

• 1 MHR (Mega Hyper Rare) Cards
   

Optional Extras:​

• Unknown at this time

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In total, a complete Phantasmal Flames Master Set contains 214 unique Pokémon cards.