Well, a seed is something that is generated when you turn on the game. Seeds each have a bunch of frames, and each frame will have a different Pokemon associated with it. So the spread for your shiny Bisharp is on a certain frame. Each seed as an infinite amount of frames. When you start your game there will be a starting frame, the frame it is when you can first control your character. You have to find this frame, then advance the frame a certain number of times to get to the frame of your shiny Pokemon.