>>3838624
>Basically shards + maxing all sub classes on a character that gives you your 300% aptitudes.
Oh and forgot the most crucial part after maxing all sub classes. Once you maxed them all on 1 character you want to reincarnate that character and put them in a fully max Elite Four squad. That's where you get a crap ton of stats. When you relevel a character back to lvl 9999 in the Elite Four squad(which is easy to do even with reduced exp) + maxed all sub classes, is going to give you around 1-2mil in all stats not counting HP and SP as those will be much higher. The rest of your stats will come from shards and lastly gear.

So the shard farming also helps with leveling the Elite 4 squad as you not only gain a bunch of shards but also a crap ton of high level prisoners. So you're knocking out 2 birds with 1 stone especially if you can farm in Carnage.