You can duel him, he's easy as hell and you'll just get money and raise your Duel Capacity
To figure out how rare your Pokmon card is, look for the symbols in the bottom right corner of your card and if you have a lot of cards, then you should become familiar with the Pokmon card rarity indicators, as well as the different sets and booster packs in which your cards were released
Some Pokmon cards have seen mind-blowing price jumps over time, and you can be a part of that success story
Bigger & Smaller & non-Cardboard Jumbo SPOILER: Click to show 600800 162 KB One more card worth mentioning is the Jumbo-sized variant of the Base Set Pikachu, which is similar to the UK 4th print (with 1999-2000) mentioned in this article
Even in Standard, you can replicate this effect with Flicker of Fate or you can play Priest and then bounce or sacrifice cards like Prison Realm for value, knowing that the creature underneath will stay exiled permanently
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