Well... I don't think that these are official Pokemon products.
First off, none of them have the copyright information on the bottom of the cards that ALL Pokemon cards do, regardless of release date or language. Second, if you'll look at the card on the bottom right of the second thumbnail image (the one of Ash with three Pikachus), Ash's foot is cut off at the top and has some text on it which indicates copy/pasting, and all of the Pikachus are the same image duplicated a few times. Given the quality of the drawing on the Pikachus in that card, it's also clear that they were not officially drawn. Also, not all of the cards seem to have the Pokeball with the number indicating which card it is in the set.
The big thing is the copyright info. Pokemon inc. would never have been able to print anything without that information on it somewhere, and the fact that they don't have it is a big indicator that they are knock-offs. Sorry :(
