Considering the strict quality control implemented in Pokemon card factories, there are only a handful of authentic error cards today, like those with miscut borders, wrong text, and wrong coloring
It should be noted that this card was predominantly played during the Mega-Evolution format of the mid-2010s
Like the previously listed Yu-Gi-Oh
This sheet hits many of the right marks in either direction, but an ideal bonus sheet ties the whole package together more effectively
Supposedly, before the original set of cards was released, the company stamped PRERELEASE on several Raichu cards and gave it to a few employees
It starts off as a 5/5 menace for three mana since you discard your hand on entry, then it's just a matter of keeping your hand small enough to maintain that statline