Mechs can walk up hills, it just takes an extra 1 mp per elevation (And you can't go up a 'cliff' where the elevation raises by more than 1 in a single hex, unless you jump, using 1 jump mp/elevation rank.)
None of the base cougar's have jump jets that I can recall. That's usually a custom add-on, so it depends whether Darimaus is using the base designs or modified ones.
@ Fenris - yeah, probably. Don't worry though, there's still a chance he's either got really bad piloting or rolls low.. yeah.. sure...
Hey, just hope he isn't one of those speedy/long range mechs that likes to keep you just at the edge of his range. those fights take forever.
Also, I would suggest not bothering with the refocus rules in your trial. You can't move OR attack during a refocus, meaning he either
A) Gets a free full round to blast you, during which you are a sitting duck and easy to hit.
or B) Refocuses himself, leaving you guys back at the roll-off.