>>48579671By that logic Super Mario 64 isn't a 3D game. It's full of 2D objects, yet it's still obviously a 3D game.
I always thought of the Gen IV games as 3D personally. I get why to some people it's weird because they're from bird's eye view, but they're definitely 3D. Maybe one day someone will make a ROM hack where you can see the world from 1st person view or a lower camera angle. It probably wouldn't look very good, but you'd see it's definitely 3D. I think it's mainly just things like the trainers, Pokemon and items that are 2D sprites in the overworld. All the buildings, trees, rocks, etc, are 3D. In HGSS there's a bit in the Olivine Lighthouse where they use a different camera angle and you can see better that it's 3D.