I've kind of already answered question 2
A comprehensive breakdown can be found here: The Different Rarity Symbols in Pokemon Card Sets Explained , but a brief summary: Common Japan designation: C image429599 44.3 KB image250250 1.16 KB Uncommon Japan designation: U image429599 46.4 KB image250250 726 Bytes Rare (Holo) Japan designation: R image660920 111 KB image250250 1.34 KB Double Rare (standard ex) Japan designation: RR image429599 58.4 KB image250250 2.3 KB Ultra Rare (generic full arts) Japan designation: SR (super rare) image430599 51.9 KB image250250 2.3 KB Hyper Rare (gold cards) Japan designation: UR (ultra rare) image660920 137 KB image250250 2.85 KB As for before Scarlet and Violet, the above is basically the same, except english did not have the updated star system for cards beyond ultra rares Note on Rainbow Rares The Japan HR or Hyper Rare rarity referred mostly to Rainbow cards

If youre a fan of Pokemon and not just the TCG part of it, you can find a wide assortment of Pokemon merchandise and plushies, like Pikachu plushies
2002 Pokemon Neo Destiny 1st Edition Shining Mewtwo PSA 10 Recently Sold for $5,700 [Source] Check current eBay listings here
Walmart is the cheapest of all with the same Booster Box listed for $229.95 with free shipping , sold by Realgoodeal and fulfilled by Walmart
Not to mention, the final form in Inteleon's move and HP isn't bad if push comes to shove and it has to do some cleaning up or take a hit