Duping can still happen, though it's a harder save hack than simply altering one's stats. It's definitely something they could build into Action Replay though, which would make it easy for anyone.
Pking and NOLing should be impossible though since you need to be actually running a code while online to do that. Xbox live should have no trouble in blocking that crap.
"I've watched while the maggots have defiled the earth. They have
built their castles and had their wars. I cannot stand by idly any longer." - Otogi 2
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