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Oh, the parameters only need to be found once. It's just a calibration. When you search for more seeds, you'll always leave those set the same. The parameters are independent of any particular seed, etc.
What do you mean by 'search with a sweet scenter'? If you are trying to RNG something in the grass, it doesn't make sense not to use a Sweet Scenter, since without one you wouldn't be able to control when you encounter a Pokemon. If you are doing a stationary Pokemon or something, you wouldn't need a SS for anything.