I’ll edit this guide as I go along, and please don’t ask for Wi-fi help in here, because this guide assumes that you have already completed all of the sidequests and have unlocked the Onion Knight and the Secret Dungeon. This guide will help you get all of the onion equipment and train your knights up to J.Lv99 so that you can take down the Iron Giant, the Ruby Weapon of FFIII.
For reference, I will list Onion items that can come from all dragons in orange, and unique items in the color of the dragon that drops them.
The first thing you need to do is keep your party at their best jobs they have, and get them to J.Lv99 and find the wandering smith and get all of their master items. If you need help with the wandering smith visit www.gamefaqs.com . For me I had a Dragoon (Magic Lance), Geomancer (Blessed Bell), White Mage (some rod), and I had Ingus master both Monk and Black Belt (Shura Gloves and Master Dogi).
You want all of this so that you have your strongest characters possible (without being Onion Knights) with their best equipment possible. Also make sure that you have the Ultima Weapon handy, because you will need it.
You want all of your characters to be at about 60 or 65. Most guides tell you not to even enter the secret dungeon before level 70, but that’s a load. You can fly back to the healing copse between each battle if you need to, plus you will be getting a crapload of Elixirs in between onion equipment. Also do not forget, do not go near the pedestal in the secret dungeon, our you will be forced to face the Iron Giant, and you will lose. So be sure and save your game every time you get a good drop from someone to be safe.
Now I will explain the Dragons. You may already know some of this, but I will cover this anyways. There are three types of dragons–Yellow, Green, and Red. You will get an item from each one that you kill, because they are the only enemy in the bestiary with a drop rate of 100% that are not bosses. Their most common drop is Elixir, so they will quickly stockpile in your item bag.
As for the onion equipment, it is slightly complicated. The set is obviously, onion sword, onion shield, onion helm, onion armor, and onion gauntlets. Every dragon is capable of dropping the onion sword, and the onion shield, and each of three has its own unique item as well (armor/helm/gauntlets). The drop percentage of the shield for all dragons is 7 percent. And the drop percentage of the sword for all dragons is 1.5 percent. This sounds daunting, but it will come quicker than you think, because the normal 19 percent chance of dropping the enemy’s most common item is now bumped up to 100%.
Now for the unique drops. Each dragon has a 4.5 percent chance of dropping its unique item. The Yellow Dragon has 79,999 HP and can drop the Onion Helm. It is the weakest dragon, but is still quite strong if you are only at character level 60. The Green Dragon has 89,999 HP and can drop the Onion Gauntlets. It is the middle dragon in all stats, but is also the hardest to run into (most of the time). The Red Dragon has 99,999 HP and can drop the Onion Armor. It is the strongest dragon and is very hard to kill at character level 60.
It will take a long time to get four copies of each of the onion equipment, but in the process the character and job levels of your Onion Knights will continue to get better. You can choose to battle the dragons with your Onions or your stronger J.Lv99 characters, it doesn’t change your chances of getting onion equipment. Some guides will tell you that if you kill the dragon faster, that you will be more likely to get an onion equipment drop. That is a lie. So just use the party that you think you can easiest kill the dragons with. It will be very hard with low J.Lv Onion Knights, but if you start to job level them up early, you will be rewarded once you start to get the equipment. That choice is up to you.
Mastering Your Onion Knights
Read this section carefully and understand how it works:
The whole reason of getting Character and Job Level 99 Onion Knights with the best equipment is to be able to strike any enemy or boss in the game for 9,999 damage with a regular attack, and then to have almost every attack do less than 100-1,000 damage against you. The only way to do this is to train your onion knights with ONE SWORD and ONE SHIELD. If you double equip an onion knight, their stats will be skewed in the way of Attack points.
This sounds more favorable, but if you train your onion knights correctly, your attacks will be just as powerful, and you will have exponentially better defense. The extra attack points will not help you, because even if you go all the way with one sword, you will still do rack 9′s against anyone (except the Iron Giant). If the onions start from J.Lv1 with a sword and shield in hand, and go all the way to J.Lv99 that way, you will have the strongest party possible. You will be able to inflict 39,996 damage per turn against the final story boss. The Iron Giant will not take maximum damage from any party, even if you had double equipped your onions you would be doing less than 2,000 damage. He is extremely tough without ultimate onion knights, and even with them he will still be a great challenge.
The Onion Blade
And once your onion knights get to Job Level 99, you will be able to visit the master smith with them in your party and get the Onion Blade for mastering the job, which is even stronger than the onion sword you get from the dragons. And once again, do not be tempted to equip your onion knights with the onion blade and onion sword, because at that level you will already be doing maximum damage and it will only lower your defense.
Content contributed by Red XIII.