What kind of bike is it when you combine a mountain bike and a trick bike?
There is no such combination.
Trials bikes are mountain bikes that one could construed as
being "trick bikes" as trials require riders to "hop" around a
complex obstacle course more than actually propelling the bicycle
in a forward motion.
I think he is refering "trick bike" to bmx? If so, the
combination is a Dirt/street Mountain bike Check out some brands
such as Dartmoor, NS, DMR, Black Market, Revell, Norco, Specialized
24seven, Identiti for info on there Dirt jump/street bikes (Dj)