Pokemon Fossil completed the transition of the first 150 Pokemon in the TCG. Mew was included in the Japanese version but was later changed to a Black Star Promo in the English version.
Fossil is a 62 card set meaning it is the smallest set to be released out of all English sets in the Pokemon TCG.
As of today Pokemon Fossil is considered to be one of the most successful sets in the world kicking off the Pokemon TCG alongside Base Set and Jungle!