pokemon.com. Granted, you can't use the old cards, but still. My guess is this is meant to be aimed at nostalgic players of the TCG you have fallen out of the game since the original sets, many who are now in their late 20's.
The game was originally released in 2000 in the US. The point of the game was to collect virtual cards to build a deck and defeat 8 "Club Masters" the same way you defeat 8 Gym Leaders in the main series games. My suggestion is if you want to relive the awe-inspiring moment of pulling a Base Set Charizard, you'll likely want to get this. If not, then this might not be the game for you. I still have my copy and my Game Boy Color, so I'll just be nostalgic that way and still keep my fingers crossed for Red and Blue. I'd love to be able to play those games and actually save my progress.