Heres A Good Strategy for That Muk: First, Use Toxic(The Damaging Move Of This Set), Minimize(So Muk Cant Be Hit, Use Multiple Times), Screech(Sets Up Swagger, Which Does More Damage To Themselves, if they have low defense), And Then Swagger(After Screech, If They Hurt Themselves, They Will Lose Half Their Health).
Hope This Helps!:)