Here's the tough part: adding in the design. If you look at a picture of Rayquaza, it has a series of yellow circles and lines that make an intricate design on its body. That's what your going to have to draw. As long as you keep in mind that the body pivots and turns as it curls, you should be fine on where to place the design. Think of the Pokemon facing left and the design has to go on its side. After you finish the circle and line design on the body, draw in an eye in the socket as shown.