My fire type would have to be my early graded Black Flame Ninetales.
After researching & posting the article The Black Flame Ninetales five years a go & with the help of this wonderful community it was recognised as an official variant by CGC and then everywhere else after.
I’m really proud to have made a lasting impact on the Pokémon TCG community and grateful to the fellow collectors at efour who helped. It will always hold a special place in my collection and memories.