Weigh the box (authentic Japanese boxes are 280320g depending on set), inspect the shrink-wrap (tight, glossy, conforms to corners), verify the product code on the bottom panel against The Pokmon Company's official Japanese listings, and buy only from sellers who guarantee authenticity in writing
Pokemon, moves, brands, and illustrators have all been spelled incorrectly
Part 1 (), Green Version () , General card (), Retail price 20 yen (tax incl.) (20()), Sales start end of September (last third) (9), Bandai () zoom312804 396 KB koro96-10-a401000799 209 KB Pocket Monsters Carddass Part 2: In the same CoroCoro issue mentioned above (August 1996), it states that Part 2 is expected to be released in the first third of October (1st - 10th) (sourced thanks to doublefelix921)
Sure, players were able to farm the card just as they could with Lapras ex and Venusaur before it, but it arrived just as the initial hype surrounding the game was beginning to fade, resulting in fewer people taking part in the event