So, I have started a secondary account recently, to optimize my chances with Lucky and high IV Pokemon from trading, Sinnoh stones from battles, etc.
At this stage, since the new account is still a low level, I have been focusing on it primarily, keeping it active on my primary device, and only using multiple devices (so I can use both accounts) during raid hours and events.
But, what I was looking into, was getting a Pokemon Go Plus, to again optimize this further. From what I've been told, using a Pokemon Go Plus is an alternative to the "Adventure Sync" option (which only tracks travel distance for candies and eggs), so these cannot be used in conjunction - it's only one or the other; which is fair.
So my question is - can I use the Pokemon Go Plus with one account, and the Adventure Sync with the other account, with only one device? Or do both accounts need to be logged in at the same time?