For individual cards and older booster packs and boxes, you will just have to gain a lot of experience and learn the nuances of real Pokemon products and then make educated purchases, ideally with a means of recourse if it turns out you were scammed (some kind of buyer protection program, etc)
Indeed, one First Edition Charizard in Moderate Play condition recently sold for a whopping $10,000
Tap the button that says, Select other booster packs. From there, you will see a screen that allows you to select any expansion
Goblin Game Year : 2001 Expansion : Planeshift If you read the text on this card and still dont understand what exactly it wants you to do, then wait a bit and read the rulings
Wondrous Wizardry Archmage of Runes | Illustration by Kai Carpenter Creature (18) Drake Hatcher Niv-Mizzet, Visionary Archmage of Runes Tolarian Terror x3 Ghitu Lavarunner x4 Balmor, Battlemage Captain Enigma Drake x2 Mischievous Mystic x2 Heartfire Immolator x2 Ovika, Enigma Goliath Instant (15) Arcane Epiphany x2 Opt x4 Burst Lightning x4 Dive Down x3 Fiery Annihilation x2 Sorcery (3) Land (24) Mountain x7 Island x8 Swiftwater Cliffs x4 Temple of Epiphany Izzet Guildgate x4 Wondrous Wizardry is an Izzet spells-matter deck that has a bunch of wizards for no reason other than to make Arcane Epiphany cost less
These weren't sold at retail