How to get flair in Pokemon TCG Pocket
Briefly

Flair in Pokémon TCG Pocket enhances duplicate cards with cosmetic effects, which are purely optional and can help achieve advanced missions for Pack Hourglasses.
The flair assigned to cards varies with their rarity and theme; for instance, a two-star Kirlia card offers sparkles, while a one-star full-art Mewtwo ex card provides purple bursts.
To activate flair, players must trade duplicate cards and Shinedust, with the flair types being cosmetic for visuals and battle flair for effects during gameplay.
Unlocking flair requires different amounts of duplicates and Shinedust, with lower rarity cards needing more duplicates while higher rarities demand fewer duplicates but more Shinedust.
Read at Polygon
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