POP Series 2
Bulbapedia gives the release date of Ex Unseen Forces as August 22, 2005, and that of POP Series 2 as August 2005. So whichever of the two actually came out first, it’s time to look at POP Series 2 now.
Since just like POP Series 1 it contains 5 commons, 5 uncommons and 7 rares (including Pokémon-ex), and since the videos I found on Youtube make it appear like the rarities are the same as well (uncommons to commons about 20:101, and a rare in every 10th pack which always appears as the second card in the pack), I can simply copy the rarity table for POP Series 1 and paste it here:
