(This is my first post so its probably trash) I want to nominate my team for the sample team because baton pass is broken:
Car Crashers (pokepast.es)
One of the main ideas I've come up with for gen 9 bpass is to deny removal of substitute/stat boosts and keep wguard mons as healthy as possible. This is done by threatening them with sunsteel strike, taunt or imprison tidy up. Good as gold can deny whirlwind, curse and perish song. Mega-Gyarados is the sweeper of choice since it has the strongest power trip that can still ohko imposter blissey after 2 ssmashes, surging strikes is a stab move and multi hit, go past opponents substitutes and the occasional mimikyu/eiscue.
Things you should watch out for:
Sleep-
Sleep moves are strong vs this team since it can stop momentum and nothing can take a sleep (before the sub) other than eternatus
Imposter-
Although imposter isn't as strong vs this team due to substitute being up the majority of the time, it is still a problem if your opponent gets imposter in vs a mon that hasn't imprisoned yet, minimized eleki or mega sciz
Prankster-
Prankster can disrupt using a variety of tactics. (Curse, imprison, taunt, encore, disable, haze etc.) You can tera dark arceus to remedy some of these flaws.
Losing mons-
There is no revival blessing on this team, so conserve your mons