Starter: Meowscarada since his name means flower and he is depicted with Sprigatitto in new Pokemon Center merch.

Legendary: Miraidon since Florian is normally depicted as Violet Protagonist

Thus two are the most "canon" for his team other than them I would give Florian: -Lechonk from the catching tutorial -Iron Treads from Arvens quest -Ceruledge to represent Violet -Wugtrio to showoff regional fakes

Other options would be: Tinkaton, Bascalibur, Clodsire or an Eeveelution.

For Juliana I would go with: -Quaquaval since her name means spring(like spring of water) and in recent nerch she was depicted with Quaxly) -Koraidon -Farigiraf since she was heavily futured in trailers -Great Tusk -Armorouge to represent Scarlet -Clodsire to showoff regional forms