I'm not sure if this glitch is already known about, but I was watching a japanese speedrunning marathon and they showed this glitch and said that they weren't sure if they were the only ones that knew about this. Here's the video explaining it: This glitch starts at 39:30 He's not super clear in his explanation, but he starts on wario and holds r trigger for a couple of seconds. Then he moves the joystick right and let it run for a while. He then stops and goes to mario and yoshi is on mario's team. I don't know if this is a jp only glitch, but here it is. If this is already known about, let me know and I'll delete this post. Let me know if you have any questions about what he says in the video.

What the heck? This is my first time seeing this