They do Asia-only exclusivity deals. I don't think I've heard of a Japan only exclusivity deal.
Also, what Nintendo release do you think is above Mario Tennis as far as releases after Mario Odyssey but before Super Mario Party go?
So basically Japan.
If we are still talking about Japan (meaning, what would sell in Japan) to answer you question, I think Octopath Traveler certainly. But nothing that could compare to a mainline Monster Hunter.