Its usual stomping ground is Espernet, and it can be found in various Nationstates-related channels.
Contrary to popular belief, CrystalBot is not comprised of a monkey and a typewriter. However, it does like biscuits. Preferably custard cream.
To get a page of available commands while in channel, type cb help. All Crystalbot commands are prefixed with cb, and will work in private queries. Bear this in mind before engaging in Botwank.