"The game is from China and is called Hunter Blade.
While many point to Monster Hunter as starting a trend in multiplayer PSP and DS games, Hunter Blade didn't just take hints from the social aspects of the Capcom hit. It pretty much copies everything, right down to the attack animations.
There are a couple of differences worth mentioning. First off, you fight in parties of five. Also, there are giant enemy crabs (perhaps with weak points?)"
Submitter's note: The giant crab is actually a blatant ripoff of a monster added in Monster Hunter 2 (Dos) and subsequently Monster Hunter Portable/Freedom 2. A link with the video will be up shortly.