How and where are you currently searching for the card? I have a guide for unlimited Japanese and will share it, but I am curious how you are looking today
Japanese set cards had 1st edition and unlimited print runs for most sets from e-series through XY. Some sets are really difficult to find in unlimited, some sets are closer to a 50/50 split between 1st edition and unlimited. Here are some tips to finding the unlimited cards. Will use Leafeon XY3 007/096 as an example.
I have had the best luck finding unlimited cards in a bulk lot listing. The search term needs to be generic as possible to allow those lot listings to populate.
eBay:
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