Bebedora's Chamber Surprises

After defeating Bebedora and pushing the button that opens the way out, walk around the newly found chamberways that also opened. There are three chests to find with lots of powerups, money, and spirit stones, as well as a second peice of the stone tablet you found in geedo's box when you met the ghost dude.

Deikbeck Impostors

Note: This can only be done as Kharg. When you encounter the impostors, they will ask if you believe that they are the real Deikbeck. Even though their names are spelled slightly different, do not believe them and choose the second answer. The first impostor is located in Parenz Ruins, while looking for the three materials required for the Tele-Op. You can find the impostor in the middle left corner of the area behind a large metal wall. You will get a Shadow Talisman. The second impostor is located in Peisus library. Once you have obtained the Lamda Sutra and have gone out, go back to the library. Go into the place where you got the Lamba Sutra and meet the second impostor. Tell him that you do not believe him and he will give you a quiz. Answer ten questions correctly and you will get a Spirit Amulet. Answer at least one correctly and you will get a Neuro Charge (can be bought in a shop inside the Flying Fortress) for your airship. The ten answers to the questionnaire from the Diekbeck imposter in the Library are as follows:

Counterclockwise 
A Cat 
Beautiful Stones 
Palkia 
How Much To Spend On the Entrants' Lunches 
A Pair of Dice 
The Shinobi Gang 
Lakelta Deimos 
A Pipe 
Buster 

You will get a Diek Screw (makes Diekbeck very fast) if you answer less than five correctly, a Neutrino Chage (for Airship) and Clivis's Book (rids player of all abnormal status) if you answer between five and ten, and the Spirit Amulet (blocks Fire, Wind, Water, Earth, and Light attacks for Kharg to equip) if you answer all ten.

New Game+

Successfully complete the game to unlock the "New Game+" option. This allows you to start as Kharg with a King Statuette, 999 Spirit Stones, 3 Diamond Coatings, and 100,000 G; or Darc with a Romantic Stone, 999 Spirit Stones, 3 Diamond Coatings, 10 Bountiful Fruit, 50 Dilzweld Bombs, and 100,000 G.

Dragon's Wrath And Storm Medallion

When you fight the two giant dragons in Darc's story, kill the Golden Dragon for a Dragon's Wrath, which puts Darc's counterattack to 100, or the Silver Dragon for a Storm Medallion. If you want both items, take the extra time to steal from one dragon after killing the first.

Golem Mask And Stuffed Bear

When you fight Bebedora and her two Altimas, it is a good idea to either kill the Altimas or steal from them to make sure you get Bebedora's Stuffed Bear and Maru's Golem Mask.

Herbs

Use the following trick to get ten free Herbs. In Chapter 1 of Darc's story, after you get Densimo into your party go to the entrance of Gorma's House. Look to the left, and you will see a yellow skinny Orcon walking around. Talk to him and he will note that Densimo is in your party, causing him to start talking about the five Wonders of Orcoth. Pretend that you care about what he says and say that you will listen. He will ask you a few f times if you are still interested in listening. Lie and say "Yes". Eventually he will ask you how many words were in the spiel he just gave. Choose the one that reads 600-800 (the fourth choice) and he will give you ten Herbs. Note: You must do this while Densimo is in your party. Doing it before or after results in you obtaining nothing.

Knuckle Guard

When playing as Kharg in the beginning of the game, after going through the entire Banjo, Lloyd, Spirit Stone scenes, go to the bottom- left of Yewbell to the refinery. Talk to the man outside and he will say he is waiting for Banjo so he can unlock the shop. He asks you to go find Banjo. Say "Yes", then go to the item shop. He will be in the upper-right corner. Talk to him, and he will give you the Knuckle Guard. It increases only Kharg's Defense and Guard,and it is a good weapon part at the beginning of the game. When you no longer want it, sell it for 350 G.

Better Aiming

To aim better without moving from your current position, when controlling your character, hold R1 during a battle. An arc will appear. The highlighted arc shows the range where you can attack. Aim at the enemy and attack.