Turns out that rain teams are kind of OP. In fact, here is one right now!!!
https://pokepast.es/518c16b234a9ab40 It has all of the basic rain cores but I put Talonflame in there for priority Hurricane (which is super good) and used a E-Speed band Regieleki because it tears through everything. Mantine is really good because ovi. Feel free to make some changes where they are needed and I hope you like it!