Of course it is possible.
All 3 major consoles can have trainers done for them. With the PS3 jailbreaked etc it is very very possible now.
I heard there was a trainer for Dead Rising 2(PS3), but the chance of success was slim and and it was kind of complicated.
I remember there were trainers for PS2 by running them on disc. I hope there will be same solution for PS3.
Trainers can be made for console games but alot of trainer makers dont make them for consoles because it takes alot of extra work then it does to make them on PC.
All times are (GMT -06:00) Central Time (US & Canada). Current time is 4:22:15 PM