The Omnitrix (the watch-like device he uses to transform into an alien) has 10 aliens at time. But it happened that Ben managed to "unlock" more aliens by collecting their DNA.
Ancient Aliens - 2009 Aliens and Dinosaurs 4-10 was released on: USA: 4 May 2012
It is assumed he doesn't, as the new aliens are "fusions" of the aliens from the original series.
None of them has all the aliens
ben got his aliens from his watch
63 aliens.
Ancient Aliens - 2009 Aliens and the Lost Ark 6-10 was released on: USA: 7 December 2013
Ancient Aliens - 2009 Aliens and Evil Places 3-10 was released on: USA: 9 September 2011
Ben 10 has more than ten aliens while protecting the earth.
10
Evil Aliens was created on 2006-03-10.
XLR8