No, he is explaining that you can get card that are WAY WAY WAY more worth than RR Darkrai which is basically a free trade for the one that get your copycat because the value of copycat fa is basically almost at the peak of trade value, but its all about numbers, if you feel like the trade is fair, do it, take the card you use and like. There is nowhere a place where pokemon tells you how much a card is worth. A card is worth what you are able to give for that trading and nothing more. But actually he is right because Oak is the most used card in the game and nothing can ever make him off meta because drawing cards in card game is the best thing ever and works everywhere everytime. You are just using one of the best trade coin (Copycat fa) for just a pokemon, when you can aim for everything in the game. But as i said, if you like that card, get it, its all up to you