Pokémon Meiji slides are a fascinating rare niche of Pokémon collecting! Vintage Pokémon Meiji slides / mini frames are considered very hard to find today for a few reasons:
Meiji, the Japanese confectionery company, released Pokémon collectible slides/mini frames in the late 1990s and early 2000s as bonus items inside some chocolate or caramel boxes. Most of these fragile slides were discarded, damaged, or lost soon after being opened as people had not really started collecting Pokémon items. There is also no record of how many different slides were produced. A “collect all 60” sign has been recorded but we know that many more slides were produced.
Unlike trading cards (which were printed on durable card stock), these slides/frames were made of thin transparent film with fragile plastic framing. They bend, scratch, and fade easily, and very few survived in pristine condition.
They were a Japan-only promotional item, and Western collectors often didn’t even know they existed until years later. Production runs were relatively small compared to the global Pokémon card print runs. Estimates run from a low of 100 for the rarest slides to no more than 10,000 or 20,000 for the most common.
As Pokémon nostalgia exploded, collectors began hunting obscure promotional items. Since the Meiji slides/frames were never mass-collected, the surviving supply is extremely tiny.
Scarcity and increasing demand has made them a “legendary” rarity. Surviving examples today are highly desirable to Pokémon collectors.