All Djinnis on standby, use most powerful summons
Also is there going to be a Golden Sun 4?
I never played the other two (I never even saw them in shops...should probably get an emulator or something), but I have played and completed Dark Dawn. My only real problem with it was that it was way too easy, I didn't get one game over while running through it. Summon Rush the bosses (All Djinnis on standby, use most powerful summons (and yet, somehow, with the nearly no health that comes from having them on standby, I didn't die)).
wat?my team is only like lv44 should I go back and kill more stuff to lvup?
Do yourself a favor, go find the GBA games... they're A LOT harder than Dark Dawn (almost as hard as Final Fantasy V... maybe FFIV level), there are not so many "points of no return" where you can permanently miss Djinni and rare items, the 2D sprite-based graphics are just as impressive as anything in 3D (if not more so) and the gameplay stays pretty much the same (the only significant gameplay aspect that was added in Dark Dawn was the characters' weapon levels and some new Psynergy). I think the story might have been better too but it's been a couple years since I played it so it's hard to judge.