Many collectors who appreciate high-value cards from older eras also look into iconic vintage sets like Japanese Neo Genesis, known for some of the most important early Pokmon cards ever printed
Which may have explained the higher valuation later on, when compared to before that date as the profit stream would be higher (depending on how much they paid for it)
Im still working on my list though, sorry
Mega Venusaur basically has a couple of months before it gets put on a stake and over a campfire, making a Wellspring tech an absolute requirement
Details of the authentication process include: Thorough Inspection: Using an extensive database, authenticators assess the card's condition and quality, ensuring it matches the listing description and verifying authenticity
Onix [Series II] #95 Pokemon Japanese Vending Keep track of your collection value over time