trust me, the themes in gen's 3, 4, and 5 are quite apparent. 5 is by far the most philosophical, i personally got tired of all the talk about truth and ideals with ghetsis/n/alder.
gens 1 and 2 were pretty much good vs evil, but they didn't really push you to think about it. team rocket was, like i said, just straight up gangster. they didn't have any misguided plans to change the world, they were just a crime syndicate.
giovanni = best boss of all time.
archie and maxie = lame
cyrus = garbage
ghetsis = weird, but cooler than those guys. only by a little bit.
N = very very strange, interesting character. just wait till you guys see his room... god, that was a well done scene. i was legitimately creeped out. the musical ambience reminded me of lavender town.