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The models from Pikachu and Eevee, are the same model but upgraded, you can tell because most of the models wireframes are the exact same while other parts of it are tuned up.
Pikachu's arms, legs, neck, and cheeks have more loops on them to let them animate better, and his mouth is actually fully modeled.
We know for a fact that Pikachu's model is the old 3DS on because his mouth is a texture in SS
