Prismatic Evolutions has been one of the hardest sets to find at retail since its launch, and the Pikachu hyper rare benefits from that artificial scarcity on top of its inherent desirability
You can group cards you have multiple copies of together, or if using a binder, you may be able to put duplicates into the same card pocket of your plastic insert
In case youre curious about how it all went down, here are the most important dates for the Magic: The Gathering Final Fantasy Set
Most Rograkh/Kediss decks work in roughly the same way: play Rograkh on turn 1, buff it up on turn 2 with a Dragon's Mantle-adjacent effect, drop Kediss on turn 3, and then dump all your mana into buffing Rograkhs attacks
Then you could either use this monster as summoning material in your next turn( to make bigger and better monsters), or just leave it there as a wall of defense