FINAL FANTASY IX

This trophy unlocks after you beat the the final boss of the game, Necron.

Preparation:

I recommend a Freya/Eiko/Amarant/Quina party provided they are all leveled (atleast 60+) sufficiently and have their ultimate weapons and good gear. Necron relies heavily on status attacks so the strategy is a bit more defensive than usual. Put all magic stones into status defenses followed by Auto abilities especially Auto Life, Auto Regen, and Auto Haste. Physical attack characters should also equip Bird Killer if possible. Use equipment that grants protection against Fire, Ice, Lightning, and Holy. Once you leave the menu the fight will start.

Battle:

This fight is actually one of the most difficult in the game. Necron's damage isn't the biggest problem but his status attacks are.

Necron Attacks:

It is able to cast Firaga, Blizzaga and Thundaga to your whole party or single target, as well as Flare and Holy, which are stronger, to single targets. Meteor is a pain as it can wipe you off the board if you have bad luck, and it's multi-target. Protect and Shell protect Necron against physicals and magic respectively, while Curaga restores its HP. Then there's Blue Shockwave, an attack that reduces one character's HP to 1. Neutron Ring deals heavy physical damage to all characters, which can be reduced by Protect status or using good armors. While all of this is reasonably solid, the real killer, and Necron's signature attack, is Grand Cross. Grand Cross targets your entire party and can inflict Berserk, Confuse, Darkness, Doom, Freeze, Heat, KO, Mini, Petrify, Poison, Silence, Sleep, Slow, Stop, Trouble, and Zombie in addition to reducing HP to between 1 and 10 (see why I recommended status protections?). Each of these effects is calculated separately for each character and effect, and will fail if you have immunity, so you may end up with all of the statuses being set, only some of them, or none at all.

Strategy:

The primary issue in this battle is dealing with Grand Cross. If you can do that, you're in decent position to win. Angel's Snack is arguably one of the best ways to do that it uses a Remedy on all party members which quickly cures many ailments. However it does not cure Zombie status. This will make healing a royal pain, since any curatives will deal damage and revivals will miss while Zombie is active, plus it resets the Trance gauge to zero and Angel's Snack/Remedy/Esuna won't heal it (you need to use a Magic Tag). Move fast after a Grand Cross attack; a multi-target elemental or, worse, Meteor or Neutron Ring, can spell doom if you've just been hit by Grand Cross. Luckily, it can't do consecutive Grand Crosses, so heal quickly and continue fighting. Its other attacks are strong but nowhere near as dangerous, so keep your healer on standby and Curaga/Elixir/Full-Life/Phoenix anyone hit. Mighty Guard is also highly useful for reducing damage taken on your party, while Slow on Necron can help give you some breathing room. If you're using Freya, she may evade some of the dangerous stuff by being in the air when it's used. On the offensive side, throw everything you have at this guy. You can Throw unused high-level weapons for massive damage (remember that you're past the point of no return, and you can't save after this), and Dark Matter is a guaranteed 9,999 damage. MP is no object either (you should have plenty of Elixirs if you run low on MP, to say nothing of Ethers), and Necron defends no elements besides Earth, so Ark/Doomsday/Shock/Holy/No Mercy/etc. away.

You can also make the final boss a joke by using the 9,999 and Battle Assistance boosters.

Once you have defeated Necron, watch the ending cutscenes to Final Fantasy IX. You will obtain this trophy after the credits.