I thought the same, but from the
Mobygames page of Pokkén:
As before, note that this includes
everyone listed on Mobygame -- staff from Nintendo EPD, staff from Namco, staff from NoA and NoE handling localization, supervisors from GameFreak and Creatures, etc..
This means that, at most, 60 people worked both on Pokken and on a Tekken title. Maybe some key staff is shared between Pokken and Tekken -- kinda like Splatoon and Animal Crossing. The director and the lead game designer did work on Tekken 6, as game designers.
When New Pokémon Snap was released, the director said
in an interview
This pretty much sounds like "the Pokkén Team did a good job, and we were trusted with New Pokémon Snap".
Btw, the lead game designer of Pokkén and Snap, Yasuhito Kobayashi, also worked on Smash 4 for the planning -- so there
is a bit of overlap with Studio 2/Studio S. But Pokkén and Snap are not listed on the Studio page. Maybe the core group of people from Pokkén and Snap got assigned to different projects, and the team effectively dissolved, or maybe they are part of a bigger studio (Studio 1?).