I learned all my drawing skills on my own, with some references from the internet. lol That's all. Half of my skills are already achieved back in 2010 when I haven't even had my own computer and internet.
I draw almost everyday. I check the original drawing and try to follow it closely when drawing it for the first time. Try to follow as many poses as I can. Then slowly imagine a 3D model of the Pokemon. Then try to draw out what I imagine. Takes a while. lol That's one way that I do.