This exploit arrived with the latest patch (9th of December). I do not believe in gatekeeping information, because I think the more people know about this and use it, the faster the developers will fix it, which is why I’m telling how to do the exploit here.
1. Pick Cramorant
2. Choose Goal-Getter as your battle item (it is not a must, but it makes the exploit easier to execute, since it makes it harder for opponents to stop you).
3. Choose Score Shield as one of your held item (it is not a must, but it also makes the exploit easier to execute. Same reason as above).
4. Collect a small amount of scoring energy (the smaller amount you have, the easier the exploit is to execute).
5. Make sure you do not have boosted attack saved before doing the next step (you can enable the boosted attack gauge from settings to see if you have it saved or not).
6. In quick succession use Goal-Getter, place Whirlpool at your feet, and immediately score afterwards.
7. If you did it correctly, your Cramorant will be invincible until you score again (so if you want to be invincible for the entire match, simply do not score again).
*EDIT:* *Here is someone else’s (https://www.youtube.com/watch?v=8CdOLRLUdxQ&t=27s).*
*EDIT 2:* *The Japanese twitter account of Pokemon Unite has [acknowledged the bug and are looking to fix it in near future](https://twitter.com/poke_unite_jp/status/1470404101397946368?s=21).*