You will have to guess both the year that the card was released and the Pokemon card itself. For example, 2022 Radiant Venasaur.
All answers are found at this website:
https://cardcollector.co.uk/rarest-pokemon-cards/#:~:text=Top%2033%20Rarest%20Pokemon%20Cards%20In%20The%20World,Championships%20Promo%20No.%202%20Trainer%20...%20More%20items?adlt=strict&toWww=1&redig=3CBDBD95A4EA4B439F09504F94175C3F