>Screenshot shows Unreal Engine 4 (and something that looks like a visual shader editor, I'm not really familiar with UE) and a high-poly Pikachu 3D model on the left.

The Job posting site: https://www.creatures.co.jp/recruit/1261/

They mention Maya (3D modeling program by Autodesk), Unity and UE. However, the image and the fact that other 1st party games are made with Unreal (Yoshi) suggest that Pokemon might use it as well.

https://www.reddit.com/r/NintendoSwitch/comments/7l4psg/job_posting_on_creatures_incs_website_hints_at/