If you want an easy to build weather team, for the love of god please just use rain. Sand is shit now. If you really insist, then I'd say you'll absolutely need Exca and perhaps hippowdon. Mixed thundy isn't very good in this meta. Perhaps Koko instead? idk, i'm tired rn so i can't think, just don't use sand please, especially not sand balance. This isn't gen 6.
Ok thanks for your wisdom lmao