Read title. I have one for my avatar but i ordered that one. I want to customize my own!

I suggest you get some king of digital imaging software like Paintshop pro of Photoshop. If you don't want to spend money, you can try gimp shop. Paint also comes standard on all windows computers.

Well, ask whoever made it. Btw- a tip - Like your avatar, LeafGreen/FireRed are easiest to sprite.

well i have photoshop. but how do you make dem small?