I wish I could remember, it would be one of the common cards sitting at the front of a base set booster pack when they first came out. I probably couldn't of told you half an hour later, so after over 10 years there is no chance of me knowing...
My first Pokemon Card was a Base Set Charmeleon. Funny story, some kid at school got tired of the game so he threw the card into the bushes and I got it. Traded it the first chance I got for a Diglett card then I ended up collecting more. My first rare card was a Base Set Holo 1st Edition Charizard that I stole :S