Pat the scallops dry with a paper towel. Season them with salt and pepper.
Heat a large skillet over medium heat. Add the butter. Once melted, stir in the garlic and the pepper flakes. Add the scallops in a single layer, making sure not to crowd the pan. You may need to do this in two batches. Cook the scallops until they are opaque, about 2 to 3 minutes per side. Don’t cook longer or they will be too tough!
Serve the scallops topped with the watermelon salsa. I love to serve these with jasmine rice too. However, if you’re having a dinner party or making them as an appetizer, they are great on their own with the salsa. As a great accompaniment to surf and turf!
Combine all ingredients in a bowl and stir. I like to make this first so the flavors can marry together. You can also store leftovers in the fridge.