This was the guide for getting the first skylanders to work: http://www.wiihacks.com/wii-games/98...ure-guide.html
I think the same guide was useful for people to get the second game working, so I'd presume that the same guide would still work for this one.
Main things to keep in mind:
- Make sure your mod is current (see Softmod Any Wii guide if it isn't)
- Make sure your loader is current (see same guide - chapter 3, or the downloads linked in my signature)
- Make sure you are using the correct cIOS for the game. That will be part of the guide I linked above. If you use CFG, it has the ability to let you choose AUTO for cIOS to use and it figures it out for you.