BvqR zxi5 does a lot of research into tool assisted runs and game hacking. He does work with Star Fox Adventures among other games, so he's discovered a ton of new techniques and interesting scenarios. In this video, we see Krystal replacing Fox in the intro cutscene of Boss Drakor. The video description contains the codes used to make this happen.

If you're interested in all the other codes BvqR zxi5 has discovered, you can see his page about AR Codes for Star Fox Adventures and also check out the page about version differences.