@teamrocketop Yeah, which sets are released in which languages is annoying to find out unfortunately. Most English sets are also printed in German, French, and Italian, although there are some exceptions unfortunately: Skyridge nor Arceus weren’t printed in French; EX Power Keepers nor Surpreme Victors weren’t printed in Italian; Double Crisis was not printed in German nor Italian (but was printed in French and Portuguese).
Portuguese and Spanish are almost completely at random across all sets, until it stabilizes around the XY era. A lot of DP, Platinum, and HGSS era sets that were available in Spanish lacked Reverse Holos however, and all XY era sets lacked Portuguese Reverse Holos. EX Team Rocket Returns was only printed in English and Portuguese. EX Legend Maker was printed in German, French, Italian, Portuguese, and Chinese, but the Portuguese and Chinese sets lacked the Secret Rares.
Most of the other languages aren’t too hard: Dutch was only printed for the Base Set, Jungle, and Fossil (and two Pikachu promos); Chinese for the Base Set, EX Legend Maker (and Plusle and Minun Deck and some POP promos), and some Sun & Moon era sets; Polish only the Diamond & Pearl and Mysterious Treasures sets (and two Pikachu cards in the Pikachu World Collection 2010 set); Russian from XY to and including BREAKthrough (and some promos and blister holofoil alterations); Thai and Indonesian have their own Sun & Moon sets (six for Thai thus far, and I think the sixth Indonesian actually released last week), they do each have their own decks and promos though (if you are looking for set lists: here is the first set list, and you can navigate at the top to other sets and at the left-hand size to decks - some of the latest sets and decks aren’t completely filled in yet though).
And promos in general for other languages is a pain to find out tbh. It’s so random… I even have a Pikachu which was released in English, German, French, Italian, Spanish, Portuguese, Korean, and even Russian, but lacked a Japanese release. 
Ah well, I guess that makes collecting a single Pokémon in all languages and variations interesting. Gaining knowledge along the way is part of the collecting journey. 
PS: I mentioned some Thai sources for cards here a couple of days ago.
Greetz,
Quuador