Take shop vac or blower & force air through line until it bubbles up inside pool. While blower is still running close shut off valve & plug line with a rubber plug as a back up in case of valve failure.
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A "center" drain or main drain is "good" in that it is usually located at the deep end of the pool and will circulate the water in the lower half of the pool better than if you only had just the skimmers at the surface. You will get less complete circulation if you used only the skimmer - You would essentially be circulating only the first two feet of the depth.