To pickle the watermelon rind, combine the champagne vinegar, water, sugar and 1 tablespoon salt in a large bowl. Carefully remove the rind from the watermelon. Using a mandoline or sharp vegetable peeler, shave the rind into ribbons about 1/8-inch thick. Add the watermelon rind ribbons to the bowl and let stand at room temperature for at least 1 hour. Drain and reserve the pickling liquid.
Dice the watermelon flesh into 1/2-inch chunks and add to a large bowl. Add the Castelfranco, dandelion greens, red onions, pickled watermelon rinds and watermelon radish to the watermelon chunks and toss to combine. Add 2 tablespoons of the pickling liquid and a nice drizzle of oil into the salad and toss to combine. Season with salt.
Heat a large nonstick pan with some oil over medium-high heat until the oil shimmers. Pat the scallops nice and dry and sprinkle with salt. Sear on each side until golden brown, about 2 minutes. The scallops will be done when they are no longer translucent, but it's important not to overcook them. Remove them from the pan and allow to rest for 5 minutes.
To serve, slice the scallops in half lengthwise and nestle alongside the three-watermelon salad.
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