Raid Guide Update Under Friendship System
I hope Gamepresser could update the old raid guides like Snorlax, Lapras if they reroll back as raid bosses in the upcoming event. I think under friendship system those previous only duoable/soloable boss in certain weather could be much easier now.
Answers
Nothing that's been in tier 4 has even a remote chance of being soloable.
As for tier 3, the only boss that hasn't been soloed is Shuckle, which if I remember correctly would require Primal Kyogre with OP in Rainy or something ridiculous like that. Apart from that, all old tier 3 bosses whose guides haven't been updated were always soloable.
No you wouldn't. Even with best friends and weather boost a hit squad full of maxed perfect C/DP Machamp averages around 93% TDO before the timer runs out against its easiest moveset and around 84% against its hardest. Besides, doesn't your friend need to actually be in the fight with you for the friend bonus to kick in?