User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-5043481-20121105160843/@comment-4212769-20121106135126

^What he means:

"No. The online mode on the 3DS is just called that way because it's the mode where you can play with others (means local multiplayer). The offline mode just lets you and Cha-Cha and Kayamba in those quests. Online mode only works with the WiiU version though you can transfer your 3DS save file to the WiiU version and play with it online."