Heat 1 tbsp of olive oil in a large skillet over medium-high heat. Add the shrimp, garlic, red pepper flakes, salt, and pepper. Cook until the shrimp are pink, about 3-4 minutes. Remove from the skillet and set aside.
In the same skillet, add the remaining 1 tbsp of olive oil and the zucchini noodles. Cook for 1-2 minutes until slightly softened but still slightly firm.
Add the lemon juice and butter to the skillet. Cook for an additional 1-2 minutes until the butter is melted and the zucchini noodles are coated with the lemon butter sauce.
Return the shrimp to the skillet and toss with the zucchini noodles until heated through.
Serve immediately, garnished with chopped parsley.