This is my third playthrougth within the game and I want to get all accessories. Plus there are some that are really useful!

I have the strategy guide, but they do not tell how to get them. So, I need help to get these:

-Adamantite
-AP Egg
-Key to Success
-Minerva's Plate

(I know how to get Iron Duke.)

Thanks!

Adamantite - Beat Beclem's Gunner's Gauntlet (Original, not Temple) at the highest level. Since the score carries from one New Game Plus to another, it is only posible have one of these on any single savefile.

AP Egg - There's one in the chocobo dungeon. There's an awesome map at GameFAQs if you need help on the layout. You can also win it from blitzball.

Key to Success - Do a perfect job of helping Tobli on his various tasks, but skip the mission to rescue the Ronso in Chapter 3, Battle Blockade. It'll be in a treasure chest in Tobli's office in Guadosalam in Chapter 5.

Minerva's Plate - In Chapter 1, activate the Shave the Hypello mission by talking with the Hypello, rather than Tobli. Then, in Chapter 2, do the mission to find the musicians in Macalania Forest, then stay in the forest once it's completed and go back and talk to Tobli's Assistant. He'll hand over a couple of bonus items, including the Plate.

Thank you Agent 0042!