LogFAQs > #911466140

There's a few things you can do, which will require a lot of saving and loading. Also keep in mind I haven't played in a long time so I might be fuzzy on some of the names / details.

-Hopefully your Claude has the Dexterity and Originality talents, since you'll need them both to customize the Eternal Sphere. I think last time I played I actually restarted the game until he at least had Dexterity, since you'll also need it for pickpocketing. They can both be unlocked via item creation, but IIRC it can get expensive, and it's a lot easier to do later once you have the Orchestra ability.

-Before you start leveling any skills up, have everyone max out their perseverance skill. This saves a ton of SP in the long run.

-Level up your Playfulness skill. This will give you enough money to buy the thief's glove, which lets you pickpocket NPCs.

-You can pickpocket an NPC in Mars Village for a treasure box item. This gives you 3 random items, one of which can be a Marvel Sword. Save and load until you get it. This can technically be done early, but it'll take you a while to get the skills/money for it.

-Work on getting Claude's Customize skill up to about 8. You'll need it to make his Eternal Sphere.

-Whoever has the most spare SP, have them level up the Radar skill a few times until you have 2 Mythril. I'd save and load here until you get these.

-You'll need to get the Sharp Edge right after the tournament. It is missable, but I don't remember the exact sequence of events here, so you'll have to look that up unless someone else can answer.

-Once you have the Sharp Edge, the 2 Mythril, Claude's Customize is skill high enough, and you have his talents, you can try to make the Eternal Sphere.

-If you recruit Ernest you can pickpocket a couple of battle suits from him. Also if you're playing as Claude you can pickpocket one when he goes back to his ship towards the end of disc 1.

That's everything I can think of.
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Like a midget at a urinal, I was going to have to stay on my toes.