http://www.gamespot.com/pocketpc/act...ty2/index.html
"Guide American, British, and Russian Allied soldiers through the battlefields of WWII in Call of Duty 2. The sequel to Call of Duty makes its way to smart phones & PDAs with a
third-person overhead perspective and 12 missions."
That's a VERSION of a game, not a port and not a direct copy - in other words, they've taken the name, redone the action type (I don't recall CoD2 being a third-person overhead game where I guided my squadmates), and then recoded with a new engine to let the new game they've created, with that name, play on a PDA or SmartPhone. It's like saying that Oblivion for the PocketPC is a direct port of Oblivion for the PC or Xbox360 - it's not, and is a completely different game with the same name (Oblivion for PocketPC is basically something more like Ultima than Morrowind).
Also, the reason emulation takes so damned much out of a system is because you're using software to emulate/mimic hardware functions for the system the program you're using the emulator for was originally designed for - this means that your CPU works at least twice as hard; both to run the program that translates the instructions from GBA-ese to PocketPC-ese, and also to do the command that the PocketPC-ese tells it to, in order to do what the game demands of it. Thus, with an emulator, you've basically got a very inefficient way of translating one machine's instructions into something that the other machine can understand.. and then returning the data so that the emulated game knows what to do next as the previous command's been done. It only gets worse when you deal with DirectX-based games... since they assume a level of processing power on the PC's side that doesn't currently exist on PDAs - the video cards and CPUs of desktop machines even four or five years ago are still, from what I recall, about 5-6 years ahead of where PocketPCs are; yes, your XSCale processor may run at 624MHz, but its processing power probably is closer to a Pentium 166 than it is a P3-600. When you combine this with the fact that you're probably going to need double the original system's specs to do the emulation, if not more.. well, we've got a ways to go yet, on the PocketPC front.
Incidentally, none of the links you've brought up to date indicate that there's an actual Renegade port to PocketPC yet.