Bizarro Sephiroth

[DLPB_]

This battle has puzzled me since the beginning, so can anyone shed light on it?

When you defeat Jenova easily, this battle then includes 2 or 3 parties instead of just the 1.  But I have a feeling this is meant to make the battle harder (Perhaps they designed it so you could only defeat the Core once the other parties had beaten off their side of the enemy.  In the game, however, you can just kill Bizarro the same way as always (by defeating the main body), using the first party.  You don't need to attack the Core at all.

[NxK]

Yes, in the 1-party battle as well as in the 2-party and the 3-party battle, killing the main body of the 1st party's Bizarro is sufficient to win. However, in order to be able to attack the core in the 2-party or 3-party battle, you need to kill parts of the 2nd or 3rd party's Bizarro, whereas in the 1-party battle, you obviously don't need to switch. So, if you can't easily outdamage the core's constant healing of the main body (which you might not even if you kill Jenova easily, i.e. fast), you need to switch to the 2nd or 3rd party, which is supposed to make the fight harder as you need to setup more than just 3 characters etc.

[DLPB_]

Thanks for that.  Still, it does appear to b really badly implemented...