make a Rainstall/Rain Balance team without Ferrothorn.
i've done this before Lati@s was released but it gets a bit tricky with them out now. I gave this a thought again at the bus early in the morning as to how to cover them up but it might not be enough. Regardless, here we go.
SDef Dialga with Dragon Tail (lol)
Hopefully between Forretress, Dialga, Giratina-O, and Scarf Palkia, Lati@s can be contained. Nothing's really out of the ordinary in this teamset. You will likely have some issues against Palkia but most rain teams do anyways. Try to not let Manaphy set up too much or it'll break the team, so keep it away with Dialga's DTail and eventually the Thunders from Palkia/Kyogre.
Watch out for Gastrodon because it can actually do a lot of damage to this team. Gastrodon kindof sucks anyways so you probably won't see much.
Alternatively, Scarf Kyogre/Latias could work on the last two slots but this mangnifies the lati weak so idk.
Excadrill/Skarm/Kyogre/Grassceus/Giratina-O/some rayquaza counter could also maybe work but the last slot can actually be difficult. The team currently doesn't lead very well (imo) so /shrug. Watch the 3 fire weaks. Surf Lati@s destroys this but no one uses Surf really but you might still want to keep an eye out on that. Manaphy prob forces you to run cm on grassceus.
Ugh Ferrothorn is just super annoying and I try to avoid using it as much as possible because Ferrowars are incredibly stupid and there aren't really a lot of counterplays around it.