try this
1. Download a copy of Softchip R99. There is 2 version of Softchip R99, the first one is .wad where you need to install it via wad manager and it works like a channel. While the second one is .dol version where you can launch it straight away from Homebrew Channel. So, I will use the second one which is .dol version because the compatibility is higher according to the developer and it works directly from Homebrew Channel.
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 to get your Monster Hunter Tri working.
Game’s Language: default
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
Then Press A
5. The game should work properly. If the game is working then you should stop reading this. If the game is not working and the video freeze. Proceed to Step 6. Your IOS55 might have some problem.
Disclaimer: I take no responsibility if your Wii is bricked or what so ever when you install cIOS55BugFix. But it should install fine. Proceed if you dare!
6. Now what you need is a wad manager, download the latest version of wad manager and copy and paste it like how you did it for Softchip.
7. Google for cIOS55BugFix WAD. Download it and place it at SD:\wad folder.
8. Now go to Homebrew Channel and open up Wad Manager, follow the on screen instruction to install cIOS55BugFix.wad (if you don’t know how, google for instruction)
9. After installing it, go back to Softchip R99 and use the above settings to start the game. It should be working properly.