Where it comes from
List of Pokémon Trading Card Game expansions - Bulbapedia (English sets) Bulbapedia (community wiki), via Internet Archive snapshot 2026-10-04 · 12 September 2026 Open the original ↗
The line in the source
POP Series 1 17 September 2004 POP1 ; POP Series 2 17 August 2005 POP2 ; POP Series 3 17 April 2006 POP3