Snubble (who isn't one of the original 150 Pokemon, but who's featured in the Pikachu's Vacation short before the 1st Pokemon movie) is made with a toilet paper tube, a printer, a piece of paper, some crayons, scissors and glue.  I always prefer to use a heavy paper (like construction paper), but it isn't necessary.  

Buru pokemon craft

Template for a colour printer

Template for black & white printer