From SmashWiki, the Super Smash Bros. wiki

Umm, since then was this confirmed? Was it on E for All?--Darkangelsv1 -- :P 17:49, October 23, 2007 (EDT)

There was a video of some gameplay at E for All (or maybe even the hands-on they had the week before). Somebody opened a Poke Ball on Pokemon Stadium 2, and it was Bonsly. Unfortunately, we don't know if it does anything, because it proceeded to accidentally run off the edge it was released by. Teamrocketspy621 17:55, October 23, 2007 (EDT)

Bonsly does Nothing except walk around... until you pick it up and Throw it causin major damage!Masterman 01:35, 14 May 2008 (UTC)