Tales of Vesperia Cheats

Unlockables
Once you completed the game for the first time, the following secrets will be available after you saved your game clear data which the save file will have a star in it.

EX New Game: After creating a game clear data, the "EX New Game" selection will now be accessible where a game clear data is required to get this to work.
Grade Shop: Once you loaded your game clear data in "EX New Game", the Grade Shop will be available each time you start a new game in this mode.
Nam Cobanda Isle: This area will be available after you load your game clear data. You'll find it on the northwest end of the world map.
Unknown Difficulty: In the Grade Shop, purchase "Battle Rank" for 50 Grade points.

Repede's Body Armor Glitch
Near the end of the game, there's a chance to synthesis an armor called "Aer Fragment", at the same time, there should be 2 synthesizable armors for Yuri and Karol called "Mumbane" and "Mumbane Aer". Well, "Mumbane Aer" is an armor slightly better than "Mumbane" which needed 1 "Aer Fragment" (Repede's armor) and 1 "Mumbane" itself to synthesis it. Here comes the glitch, synthesis 1 "Aer Fragment", have Repede wearing it, then synthesis a "Mumbane" into the inventory. Now go to synthesis a "Mumbane Aer", a pop-up message will show up to tell that armor that Repede's wearing will be turn into raw material, just proceed, guess what? Repede just got an new armor which can only (suppose) wear by Yuri and Karol.

Grade Shop
After completing the game, watch the credits to the end and you will be prompted to save your game. After doing so, you will be sent to the title screen. The should be a new option called EX New Game. Select it and you will be prompted to load a save file. Select the completed file and you will be taken to the grade shop. Here, you can use the grade you earned in the game to purchase a variety of bonuses to use in your new game.

1/2 Experience - Reduces the experience earned in battle by half.: 10 Grade
10x Experience - Multiplies the experience earned in battle by 10. Very great to have.: 3000 Grade
2x Gald - Doubles Gald earned in battle.: 600 Grade
2x Grade - Doubles the Grade earned in battle.: 3000 Grade
Artes & Skills for individual characters - Keep all artes and weapon skills for each character individually.: 350 Grade each
Artes - Keep all learned artes for all characters.: 1000 Grade
Battle Techniques - Reduces the normal amount of experience earned in battle to 1, but multiplies bonus experience earned from large combos by 5.: 50 Grade
Collector's Book - Keep all collector's book data.: 10 Grade
Cooking Skill - Keep the cooking skill levels for all characters.: 50 Grade
Craft Skill - Keep synthesis skill level.: 10 Grade
Decrease Max HP - All characters start with 20 percent less max HP than usual.: 10 Grade
Double Experience - Doubles the experience earned in battle.: 1000 Grade
Enemy Book - Keep all enemy book data.: 10 Grade
Gald - Keep all of the gald you earned.: 1000 Grade
Increase Item Drop Rate - Doubles the chance of finding items after battle.: 1000 Grade
Increase Max HP - All characters start with 20 percent more max HP than usual.: 500 Grade
Increase Max TP - All characters start with 20 percent less max TP than usual.: 10 Grade
Increase Max TP - All characters start with 20 percent more max TP than usual.: 500 Grade
Increase Over Limit - The overlimit gauge fills faster, and enemies use overlimit more often.: 1000 Grade
Items - Keep all non-story related items and equipment.: 500 Grade
Max 99 Items - Increases the item limit to 99.: 400 Grade
Recipes - Keep all recipies you learned.: 10 Grade
Records - Keep all data from the Record menu.: 10 Grade
Skill SP 1 - Lowers the SP needed to equip a weapon skill to 1. This works for all characters and all weapon skills.: 3000 Grade
Skills - Keep all mastered weapon skills for all characters.: 1000 Grade
Titles - Keep all of the titles you got for every character.: 500 Grade
Unlock All Skits - Able to view all skits, even ones you haven't seen yet, at the Skit Viewer at Nam Cobanda Isle.: 1000 Grade
Unlock Battle Rank - Unlocks Unknown difficulty mode. (Super Ultra Godly Hard): 50 Grade
World Map - Keep world map data.: 300 Grade