Japanese trainer holos? I've never seen one in a deck/binder of anyone I know. I've only seen them on the internet. They're rare but not worth a lot. Depends on which one you have. Trainers are never worth a lot in any language. They add a lot to a complete Japanese collection value though.
Google search "Japanese trainer holo" and go to the images section. Since you probably can't read Japanese that's about the only way to find out the name of the Trainer card unless you know the image design from an English Trainer card. I hardly ever see Japanese trainers at all. They're not high in demand. Selling them should be easy on here. They're odd and Pokemon collectors like Japanese cards because they've never seen a lot of them.
I have a holo Dark Slowbro in Japanese from the Rocket set. Never saw him before I won him on Listia. He's worth about $5. Pretty cool find. :)
Thanks for the info. I have that card listed now along with 3 other holo's in Japanese and I do know the image design as Team Rocket. You can look for yourself and let me know if I'm right please. And I have Fanned you