How to improve baking quality in cycles render engine? I'm trying to bake a texture with the size of 256*256 px but I get an awful result, so I increased the baking size into 1024*1024 px and the output was much better than before. The problem is that I need the texture to be 256*256 px that looks as good as a 1K texture resolution, because I'm going to use it in a mobile game, so large images will not work in such games. So is there a way to enhance the baking without increasing the pixels count?
Have you tried resizing the 1k image down to 256 in a image editor? 

You not gonna get a very sharp image with such a low image resolution, I would try to manually unwrap the the object and give areas that need more detail more UV space on the image. 
You can also try adding adding UV's on top of each other if they share a identical texture on the object, so instead of 2 separate UV's there's just 2 UV's on top of each other sharing the same image. :)