I’m Dutch, and I collect all 14 languages: English, Japanese, Dutch, German, French, Italian, Spanish, Portuguese, Korean, Chinese, Polish, Russian, Thai, and Indonesian.
Mostly for Pikachu, Seviper, and my Moltres WotC #21 artwork collections, since I go for every variant and language ever printed for those. But also for my general collection and National Index (including all forms and Shiny Pokémon) collection (you can find all languages in that thread, except for Indonesian).
Only for my FA Supporter collection I focus on English and Japanese exclusives only.
Greetz,
Quuador