Quoted By:
This is the best i can come up with for an artist/painter:
Smeargle - it's obvious, it's tail is a brush
Alolan Muk - I imagine most artist would keep one around for it's pattern; it'd probably be mad at the trainer for trying to use it as paint
Kelecon - it's a chameleon that can turn invisible/change colors
Porygon-Z - literally a living 3D computer model;looks kind if like art on its own
Vivillion - It's a Pokemon that comes in different patterns
Malamar - It spews ink and the ink would probably make for good paint