Could you not steal art.
I'm pretty sure that lots of people have already said this to you, but no one has really explained it very well.
When you steal art, the original artist, who probably worked for a very long time on the piece you merely copy, doesn't get credit. It's like if you did your homework and then a bully takes it from you and turns it in, giving you no credit, while the bully is praised. That wouldn't be very fair.
If you want art on your profile, just ask. Many people on here are very kind and would probably be happy to draw you pokemon.