sculpt a hi polycount mesh.
retopology low polycount mesh for game.
copy "bake" texture ,normal etc etc from high polycount mesh to low polycount mesh.

is where baking got started a few years back but ya can use it for anything ya want.

zBrush,MudBox has remesher does retopology ,baking all in one click.

I've never tryed Blender remesher.

============================================================ 

The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance