I want a good low poly shading, for example, nintendo models are very low poly, but they don’t look low poly in-game.
There’s a way to make that on unreal? Here’s a pic of my problem:
Maybe a shader?
Thanks you 
The only way I know is tessellation, that’s the common way in general, I guess, because I don’t know any other possibility.
What i need to change or make for tessellation? And where is that? 
https://docs.unrealengine.com/latest/INT/Resources/ContentExamples/MaterialNodes/1_12/index.html
UE4 Documentation and Google are your friends 
Normal map bake from highpoly usually. Or face weighted normals. On this 1up you could get far with just smooth imstead of hard edges.
Make it smooth shaded in your modeler. Also skullwing, just no. Tesselation is just going to make it worse than high poly.