Here is another rare card you may have never seen.
This the "Super Secret Battle" Mewtwo No. 1. It was given out at a tournament in Japan. This card is featured in a new book that was just released in Japan called "Pokemon Card Official Book 2000", which is a guidebook that features full color images of every Pokemon card (regular releases, promos and tourney cards) released in Japan up until the release of NEO. Thanks to the folks at Japanime.com for the card scan & book information.