As with the Dratini, it appears that the unknown Sample Pichu is available in English as well.
I’ve just stumbled across this 2001 blog article which has this image in its header:
Here’s the image zoomed in and rotated:
This is most likely a card I’ll never own, if it even exists any more.
Another one not featured in the Sample spoiler section is this one from another page on the ASCII.jp website, which I’m not going to link to as it features images of topless women for whatever reason:
