These are one-time effects that WotC opts for when they want permanent cards that have more than one option
Like the Gym sets, this set has great Trainers, Supporters, and Stadiums for decks running cards from this set
Here's a breakdown: Starter Deck: $15$25 Booster Pack: $3.50$5 Booster Box: $130$180 Single Ultra Rare (UR): $10$30 (varies by card) Secret Rare (SCR): $20$60+ Value tiers exist: Entry-level ($0$50), Competitive Build ($50$200), and Collector/Investor Grade ($200+)
Pokmon-GX have strong attacks and high HP, so they can overwhelm the opponent's Pokmon without needing to rely on the GX attack
Well, like I hinted at earlier in the section on centering, it all comes down to rarity
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