Weapons
Ruby Weapon
Ruby WEAPON only appears after you beat Ultimate Weapon in Disc 2. You can find it in the sand under the Gold Saucer on the World Map. It's the red thing that pops up every now and then. You can either walk into it, fly into it with the Highwind or ride into it on a Gold Chocobo.
You're probably gonna need a load of HP for this fight (around 9000, although it can be done at lower), but if you follow this sequence you should be automatically healed with HP Absorb so it shouldn't matter too much.
Firstly obtain the following materia: Mime, Knights of the Round, HP Absorb, Hades, Quadra Magic and probably W-Summon.
You should also get the Apocalypse sword from the Ancient Forest as it has triple growth, so instead of getting 50,000 AP at the end of the Ruby fight, you'll get 150,000 AP!
Equip the sword to Cloud and equip the KOTR summon linked with HP Absorb. Also link Hades with Quadra Magic and put Mime and W-Summon on there as well. Don't worry about the other characters.
After you've got all these materia, go into a normal battle, not the Ruby one and kill off the other two party members apart from Cloud. This is to stop Ruby from using it's Quicksand attack which eliminates one living party member from the battle, but if you only enter the fight with one character, Ruby won't cast it. Exit the battle leaving the two characters dead and save your game.
Now enter the Ruby fight. At the beginning it will dig it's claw's into the sand and they will come up behind you. These can attack you every now and then and take some of your MP. Now W-Summon KOTR and Hades. Hades will be cast four times and will eventually paralyse Ruby and it's claws, (which will also be poisoned hopefully) leaving KOTR to dish out the damage. After that summon, the HP Absorb will give to 9000 or so HP from Ruby, negating the need for healing. Now keep miming that cycle of w-summoning Hades and KOTR. Emerald Weapon
Emerald is definitely the harder of the two WEAPONS, and you get to fight this one with all three of your characters this time. Due to AP from Ruby, you should have a second Mime as well. Keep the same materia as for Ruby except take off Hades and Quadra Magic, just give the second character the other Mime, and if you have a third Mime, give it to the third character.
Before fighting this WEAPON, you'll also need the Underwater materia. You can get this by morphing a Ghost Ship in the tunnel to the underwater Junon reactor, for which you will get a Guidebook. Take this to the Kalm traveller to get the Underwater materia. This will take off the 20 minute time limit for fighting Emerald WEAPON.
Don't give anyone any Counter Attack materia's for this setup to work. You may also want to put Master Summon (by mastering all summons and going to see Bugenhagen) linked with MP Turbo to do more damage.
Equip Knights of the round linked with HP Absorb on Cloud. Also give him a Mime materia and the W-Summon materia.
Give the second Mime materia to your second strongest character, as well as the Underwater materia. Give the third Mime (if you have it) to your last character, or just have them with high HP and no materia on them! This is because one of Emerald's attacks is called Aire Tam Storm, which is Materia backwards (aside from the Storm bit) and this attack deals damage compared to how much materia you have equipped, so the less, the better. Make sure you only have these materia equipped, no curing if you can help it. You should also have all characters at about 9000 HP.
Emerald WEAPON swims about underwater near the sunken Shinra plane (Gelnika). To get there go to the docking bay near the Gold Saucer, west of Junon, around the peninsula. Submerge and you should see the plane on the sea bed. Enter the plane but then exit it. Emerald should be standing in front of you. If not pilot the submarine around the area here and Emerald should be swimming around, it's big and green!
Ram into it and in the battle, have Cloud W-Summon Knights of the Round. He should absorb the damage done due to the HP Absorb; this stops the need for curing. Then have the second character with the Mime materia, mime the previous command. If you had a third Mime, get the third character to Mime too. If not, just have them defend or something. Continue doing this and Emerald should go down pretty darn quick! Don't worry of the third character dies, only when Cloud or the second character does, which they shouldn't if you follow the setup.
