Dual-Weather Teambuilding Advice for VGC

I’m looking to build two dual-weather teams with Greninja, Charizard, and Archaludon as my core. For my first team, I’m running Rain-Sun with Pelipper and Grimmsnarl as two additional mons. This leaves me needing one more, preferably not another support mon. For my second team, I’m running Sand-Sun with TTar and Sinistcha. I probably do need one more support mon here. For Rain, I can’t decide between Basculegion or something else like Sneasler. For Sand, I can’t decide between Incin, Grimm, or something else. Or maybe both teams could use Whimsicott?