263p - Samlip Pokemon Bread (First Edition) - 1999
Source: https://en.namu.wiki/w/포켓몬빵/초판
Source: 먹거리 기미상궁, 대신 먹어보겠습니다 : 네이버 블로그
You can check the back of the sticker to verify the copyright year and when it was made.
As the source above, there is a clip from a TV show that aired in 1998 (Soonpoong Clinic - Ep.353 Pikachu’s Sticker) which features a girl opening a bunch of this type of Pokemon Bread, which shows the stickers: https://youtu.be/dgAelUIjK8E?t=312
There is also a news article ( KBS 뉴스 ) from 1999 that focuses on the food waste as a result of these stickers, as it seems that children were buying bread then throwing them away in order to obtain stickers.
However, according to 토치의 누리사랑방 : 네이버 블로그 , it seems that the bread was re-released for Advanced Generation in 2006, and again in 2009 (https://www.spcmagazine.com/16년-차-포켓몬빵-띠부씰-수집가를-만나다_happy2-220323/?ckattempt=1) For completeness:
Samlip Pokemon Bread (Advanced Generation - Transparent Name) - 2006
Samlip Pokemon Bread (Advanced Generation - Rounded Box Name) - 2006
I am not sure of the release of these.
Samlip Pokemon Bread (Generation IV) - 2009
Noticeably has square name labels.
The 2022 stickers are covered in an earlier post.