Japanese PSA 8 Crossing the Ruins... Holo Butterfree 12

Illustrated by the one, and only Atsuko Nishida, easily one of the most iconic creators in all of Pokemon. She is not only responsible for an incredible amount of cards, but also is the one who designed incredibly popular Pokemon like Pikachu, Bulbasaur, Squirtle and Charmander! Her style tends to lean on an airbrush technique that has a soft, bright approach to Pokemon designs. 

This set is also known as Crossing the Ruins... in Japanese and features amazing artwork of Gen 2 Pokemon from Johto. The set is fairly popular given its scarce printing relative to earlier sets. It was released in March 2000 in Japan.