Lost Kingdoms II

I haven't played this game in a while, but I'm pretty sure that you can buy capture cards from the guy in Kadishu somewhere in the fountain/plaza area.

They increase in price as you continue to buy more though.

They can't be found. There is a rouge by the central statue who will sell them to you, each time you use one it will permanently be replaced by whatever you caught, unless you miss and each time you buy one the cost will increase. I don't know how much it increases by or the limit.

After you get two of then, you can copy them for free...all I can remember is that it involves vs. mode and two memory cards, though. It tells you how to do it on gamespot I think...