So I have three Pokemon characters going up that will be not only fun to draw, but easy as well. I will start with "how to draw Gastly", step by step. As you know Gastly is a species that is made up of ninety five percent poisonous gas. This Pokemon is a black sphere that is surrounded by a purple cloud of smoke. It evolves Haunter when level 25 is reached, and then Haunter evolves into Gengar for it's final form. Drawing Gastly is going to be super simple so let's get started.