Ok, here are the 2 ways how I got it working for myself using the DVD(you need this for online games though...)
Ok, lets go:
First Method Gecko OS 1.9.2
1. Download a copy of Gecko OS 1.9.2.
2. Place the Gecko192 folder which contain boot.elf and meta.xml and icon.png into SD:\apps\
3. Launch Gecko OS from Homebrew Channel
4. Go to Configuration Options
5. Use the following settings:
Game Language: Japanese
Force NTSC: Yes
Force PAL60: No
Force PAL50: No
Gecko Hook Type: Default
Load Debugger: No
SD File Patcher: No
SD Cheats: No
Gecko Pause Start: No
Bubbles On: No
Then Press B to return to menu
6. Now Press Launch Game and it should be working fine, if it is not working, use Second Method.
2nd Method Softchip R99
1. Download a copy of SoftChip R99
2. Place the Softchip folder which contains the boot.dol and meta.xml and icon.png into SD:\apps\
3. Launch the Softchip from Homebrew Channel
4. Use the following settings:
Game’s Language: Japanese
Patch Country Strings: Disabled
Set Video Mode using: Disc Region(default)
Autoboot: Disabled
Silent: Disabled
Logging: Disabled
Remove 002 Protection: Enabled
Fake IOS Version: Disabled:
Load Requested IOS: Enabled
5. The game should work now. If the game is working then you´re fine and should head out for some monsters xD.
If the game is not working and the video hangs, your IOS55 might have problems with the game.
6. Google for cIOS55BugFix WAD. Download it and place it at SD:\wad folder.
7. Now go to Homebrew Channel and open up Wad Manager, follow the on screen instruction to install cIOS55BugFix.wad.
8. After installing it, go back to Softchip R99 and use the above settings to start the game.
Now the one or the other method should work. Keep in mind that the Softchip version wont let you change your chars name, Gecko would.
Try it.
For the USB Loader, just do what the video says here:
http://www.youtube.com/watch?v=ZosgV5OcZi8
EDIT: Make sure to read the stuff in the more info on youtube.