i recomend you to look on ebay currently, i friend of mine is making THAT collection has has many more than the list gived on tha link, like the ANA pikachus (glying on Mt fuji, Manaphy, Larvitar Friend) and the Railways, the pikachu from the Pokemon center in Tokio, tha Pikachu Lucky Stadium, Etc ETc, tha most dificult to get is the Pokemon University Pikachu i guess
There is also the:
1st Editon WOTC #1 Black Star Promo
Base set 1st Edition Red Cheeks
Base set 1st Edition Yellow Cheeks
Base set Red Cheeks (shadowless)
Base set Yellow Cheeks (shadowless)
E3 Yellow Cheeks (Nintendo Power)
E3 Red Cheeks (E3 California)
Then there are the French, Spanish, German, etc. langauges.
And if I took a look, I'll bet I can find a few more.
I don't have these:
1st Editon WOTC #1 Black Star Promo
Base set 1st Edition Yellow Cheeks
Base set Red Cheeks (shadowless)
E3 Yellow Cheeks (Nintendo Power)
E3 Red Cheeks (E3 California)