just a comment about 1st in 1st out.
in the original games the amount of exp shared was not equally spread.... lemme get the figuress.... about 60/40.
60% goes to the pokemon that defeated and 40% goes to the pokemon that you swapped out.
of course this is a guy that's never touched the Black and White games. where they changed the mechanics of EXP.
so in relation to Gold and Silver, the experience for two pokemon, both active but one killing is about 60/40.
since this is Pokemon 3D and the distribution is based upon the Willz of Nillz (blessed be his name) acutal coding of EXP, i can't comment on whether this is true or not.
If it is 50/50. then the EXP Share would be useless other than for saving that first turn of battle.