Collector's Notes: The "Professor Program" Voltorb Cosmos Reverse Holofoil card is arguably the scarcest card variation in the 151 Expansion if not one of the rarest English Pokemon cards ever printed and features the stellar universe sparkling within the holofoil of the card.
One of two exclusive cards awarded to Mentors at the Pokemon NAIC (North America International Championship) who challenged tournament staff with Pokemon mechanical game questions called "Voltorb Drills".
It is rumored that less than 12 of these cards exist as of this writing, although this card may be made available at future NAIC events. It has commanded upwards of $10000 US in secondary market online auctions when sold at the current print run.
There is a companion Reverse Holofoil variation to this card.