i was thinking of this a while ago, and thought up a plot... ok, alex survives the falling of the mountain thingy and still has some of the golden sun's power doom... so, he goes to cause chaos and mischief for some reason, to test his new powers, probably... by destroying the town that the main character from #1 lives in...again, i think... so he does, and ivan or whoever is all mad, so he goes to kill alex, alex knows that ivan is more powerful, so he uns away, and gets into a temple or something and finds a weapon that lets him steal psynergy...so he does, and leaves them weak and him strong...then he goes away because if he just killed them, the game would end fairly quickly... anyway, he goes off, (probably because he wants to toy with them first, which is the excuse for every evil guy to not kill them and be over with it so the characters can level up and have a chance...) so they need to get their psynergy strong again(which also explains why they would be weak again in the beginning...)
by collecting more djynn or however it's spelled, going to djynn isle, which is composed of 6 sections, fire, water, earth, air, neutral and some other one, where the djynn leader dude lives... anyway, to get their psynergy back, they gotta collect the boss of each element, and then beat the djynn boss guy...the djynn boss guy gives them his power, and they can save the daay...or week...or whatever. yeah, it would take a lot longer than that example, but that's just the basic point