I've just been dabbling around in National Dex Doubles, and managed to make a pretty cool sun team, in my opinion. It actually works pretty well, and this Chi-Yu is just so fun to go Tera Fire Heat Wave in Sun with Flutter, and Sneasler with Rilla for some versatility. Hope you enjoy!
https://pokepast.es/dcc0747dd3c44296
https://pokepast.es/dcc0747dd3c44296
https://replay.pokemonshowdown.com/gen9nationaldex-2194689865-7bcl0h2jb8ws8rhq7kqr4tlr3x47vt6pw
https://replay.pokemonshowdown.com/gen9nationaldex-2194696011-kpmt3tpb0bwsv5aqm2pl3t4pgqd2niupw
I have so many replays of Garg absolutely dominating!