Prepare lobster tails: Using kitchen shears, split lobster shells lengthwise and loosen meat from shell slightly.
Cook lobster: Heat 2 tbsp butter and olive oil in a skillet over medium heat. Add lobster meat, season with salt and pepper, and sear 3–4 minutes per side until opaque. Remove and set aside.
Cook scallops: In the same skillet, add remaining 2 tbsp butter. Sear scallops 2–3 minutes per side until golden and just cooked through.
Add garlic and finish: Add minced garlic to the skillet for 1 minute until fragrant. Return lobster to the skillet, drizzle with lemon juice, and toss everything in the garlic butter.
Serve: Plate lobster and scallops, spoon extra garlic butter on top, and garnish with chopped parsley.