'Servo_Pointer' was not declared in this scope
You should make Servo Servo_Pointer; global, i.e. place it outside the setupfunction, e.g. after the line int average = 0;.
In your code, it is a local variable within the setup function. When this function ends, the local variables within this function (such as Servo_Pointer ) do not exist anymore.
By making the variable global, you can use it anywhere. However, it's not a good coding practice to use global variables when not needed.
A benefit of making the variable global is that you can see the memory consumption of the instance of Servo_Pointer when compiling.
Also see the comment of timemage below: Don't put #include statements in the middle of your code, put them in the beginning of your code.