this is more of an opinion question, seeing as 1,000,880 aliens haven't even been shown in the series. personally, i think it's ether upgrade or big chill.
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there was only one omnitrix in existance. it was put into selfdestruct mode and got destroyed. and then came the ultimatrix..which is also the only one.
Alien X IS on the ultimate omnitrix not hero collection i just bought it from toys r us for my son
if its the toy NO BEN10 IS NOT REAL IF ITS A REAL LIFE FILM ITS FX AND EDIT AND SX
if its the cartoon yes he can but you cant this the maker off ben 10 good night >_< :)