No they can not combine.
Dual elfin can't combine with other bakugan , but elfin can combine with klawgor and scrapper.
shadow
600g
There are pegs on the bakugan and there are corresponding indentations on the Bakunano.
It depends on the bakugan each code has a different bakugan and none of them share one
The only bakugan you can combine are 6 traps and a dragonoid or 7 traps to make a Helios but in battles you can combine 2 or more bakugans G's
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All bakugan have different codes even if they're exactly the same
Yes, there are several combiners.
some bakugan traps can combine also if you have neo dragonoid and 6 other traps then your able to create maxus drago
I think there is tryoid,helios,hades,farbros
Only the Mechanical Bakugan of the vexos combine... Marucho's just has Elfin and Tripod epsilon. Bakugan that combine will have tiny tabs so they can fit together.http://www.bakuganbay.com/Bakugan-Battle-Brawlers/Combat-Set