Notes:

People have already begun comparing models, and this is what they've found so far:

Both models have the same amount of triangles, which not only means they're literally the exact same, it's also highly unlikely they had to recreate it from scratch.

As for the bigger amount of vertices, they don't really contribute much to the model's quality outside of making the file's size far bigger than it needs to be.

…I have no idea what was Gamefreak thinking honestly.