Recently, I came across a really nice deck of Pokémon playing cards on eBay. As it turns out, the deck is a Taiwanese bootleg release, presumably from 1999. In my identification thread, @bbobrob wrote:
The side that says “1999” is followed by “calendar,” and you can find the actual calendar just by looking up “Pokémon 1999 calendar.” As with most bootlegs from that era, they just copy-paste art from different sources. (source)
Here are the pictures for reference:
Best,
orannge