Thank you! Yes, these niche cards are a handful of very few promos that directly reference the anime. If I remember correctly, they were released at the season finale of Pokemon Advanced (Season 6) and the start of Pokemon Advanced Challenge (Season 7) in Japan, marking the end of the first season and beginning of the second season of the Gen 3 anime.
I’ve had to exercise a lot of patience to wait for a sequentially graded 10 set to show up. 