Unfortunately, I don’t know a single website with all Korean cards (I wish!..). But, here some websites to have an almost complete picture of Korean Pokémon cards:
- Base Set is released in 1st and unlimited edition (2000)
- EX era Expansion Pack (EX Diamond & Sapphire in English) (2003)
- Korean 1/P Pikachu phone booth promo (2004), not sure if there were more phone booth promos (fun fact: this is the only Korean card with a new Japanese back instead of English one a.f.a.i.k.)
- Black Star Promos (2009-2010)
- Start of an Adventure up to Guardians of Ancient Times - ten sets in total (2010-2011)
- There are also a bunch of decks for some of these sets, as well as some Korean exclusives for the XY era, which can mostly be found searching for “KTCG” on Bulbapedia
- BW Black Star Promos (2011-2013)
- XY-P Black Star Promos (2014-2016)
- SM-P Black Star Promos (2016-2019)
- S-P Black Star Promos (2019+)
- XY, SM, and SWSH era set cards (and some earlier cards from 2010+, but not all) can mostly be found here (if you want to look for a certain Pokémon, look up its Korean name on its Bulbapedia page in the “In other languages” section - i.e. Pikachu = 피카츄)
A.f.a.i.k. know, all BW and XY era Japanese sets were also printed in Korean. It’s possible some were skipped, but if that’s the case I don’t know which. All Japanese XY and BW era Pikachu cards from regular sets I have also been able to find in Korean.
If there is any card or set in particular you want to know is released in Korean, I can see if I can find some information perhaps.
Greetz,
Quuador