I’ve been trying to find these cards everywhere and 99% it is a dead end, I’ve sent e-mail to store owners, contected the very few savvy people I could find, but still nothing.
I found this store: cwtcg.cafe24.com/But I’m pretty sure it’s not on business anymore.
I’m particulary looking for Koffing and Weezing from set 10 and the Gengar Lv.X, which is a promo card there.
Older Korean cards are indeed a pain to find. 
I had loads of trouble before as well (and now again with some SM & SWSH Korean promos tbh…). Your best bet is to find someone who lives in South Korea to help you out by looking at their local markets.
And just to make sure, these are the three cards you’re looking for, right?
17/40 Koffing and 18/40 Weezing from the Guardians of Ancient Times set and 012 Gengar LV.X from the Promo pack 3 (Korean Black Star Promos).
I’ve just looked at tcgbox.co.kr, the only Korean webshop I know for Pokémon singles, but unfortunately these are too old. They primarily sell from the BW series onward.
Try to find a Pokémon collector living in South Korean who’s willing to help you out through social media (Facebook, Instagram, reddit, YouTube, etc.). That’s your best bet in finding these cards. Especially that promo is going to be rough to find.
If you somehow come across another Korean webshop which sells Pokémon singles besides TCGBox, lmk. I’m still looking for a bunch of Korean promos, so I’d love to know about a few more Korean webshops selling Pokémon cards. I do know a Korean middleman website to ship orders internationally in that case.
Greetz,
Quuador
Yeah, it’s those.
Well, there is the store I posted, I emailed them and still waiting for an answer, they have a massive stock if on business.
tcgbox does have some older promos in stock(DP-P 003,005 and 007) and have some cards that I will grab later down the line.
Finding a korean collector will be rough, it’s too difficult to search when you have no idea on what you are writting.
The 세계정복tcg store you linked seems to be operating but on a really low number of orders and interest (I feel like it’s a side gig of a board game cafe or something like that).
In Korea, it is common to trade using blogs and Instagram, rather than through websites. I found this cafe.naver.com/pokemontcg/118660 - A Pokemon TCG community where people trade. Look at the options there if you can, or I can look for it tomorrow. Cafe by Naver is like Reddit, but in the form of simple blogs/websites.
I feel like this is the efour of Korea, but will check further. I doubt many there will be willing to ship abroad, but this is 100% the best place to look for vintage stuff and ptcg in general. This is the Buy Section. I will try to look for the specific cards you mentioned tomorrow 
.
You need to be a Korean citizen to be able to register and view or participate in the threads. I can see people selling a lot of stuff there including some of the packs DP-10. If you find a Korean middleman, this is the place to buy from.
I personally can’t login as I am not Korean and as for my fiance, it tells her that she needs comment karma before properly viewing the posts (?) (I will try again later lol)
Thank you very much for the help, too bad only korean citzens can access it.
Looking forward the results.
@goonhoon Oh, that’s pretty interesting. If you somehow are able to access it, could you also try to locate some of the Korean Pikachu cards I’m still missing? Of course try to look for @shed 's cards first, since this is his thread, but any help with these last few missing Korean Pikachu cards would be greatly appreciated. (Here is my Pikachu wanted list, with the (currently 8) Korean Pikachu cards I’m still looking for at the bottom of the Official Releases section; and I’m also looking for the Korean exclusive Ancient Mew with copyright ©2020.)
Greetz,
Quuador
Still no luck getting approved. I think we won’t be trying more since my girlfriend can’t, honestly, be bothered and I cannot do much without an account myself. However, we wouldn’t be able to buy anyways as most people directly state that they prefer either trade or selling just in Korea. I will hopefully be in Korea from next Summer so I would assist you more then.
What I wanted though is to guide you guys to this site, and when you find someone actually residing in Korea who’s willing to help then this is the site you should show them.
Sorry guys not much I can do at the moment!
It’s fine, You’ve done more than enough, now I know where things are, just need to find a way to interact with it.
Happy to help! Once I move to Korea (which won’t be before 2022), I will try to establish some kind of a middle-man service between KR and eFour. Until then, good luck! Let us updated.
My wife is a Korean citizen. No luck on those specific old cards. I found a lot of the Pikachu V and mew 2020 promo but they’re a tad expensive. Also we’re in the US so she’d have to ship to her mom then her mom ship to us.
Well, I have finally found it, out of the blue I just googled it and there it was, a recently listed item on Bunjang, then I looked for a proxy shopper that deals with bunjang and also found it, too bad they do not work on Sundays
