Before we talk about how to obtain flair, we need to talk about a couple of terms used in Pokmon TCG Pocket to help you understand what you need to do
Knowledge Exploitation Knowledge Exploitation has so much upside value if you can understand your opponents deck

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[3] Over the next five years, Wizards of the Coast published more than a dozen expansion sets for the game, allowing the company to sell millions of cards and earn more revenue from Pokmon than they had from Magic: The Gathering in its first 10 years
The odds in Final Fantasy play boosters are 1 out of 3 play boosters with a Through the Ages card in a common slot
But overall, Wailmer turned out to be far less generic than I thought at first, and was a pretty good Water type, that can actually do something in the later parts of the game