Unfortunately, that's a not exactly a good Nature seeing how shallow Swanna's Physical movepool is. Swanna is better going Mixed or fully Special.
And it has very low Speed IV too....
Still, congrats for finally getting a shiny
female Ducklett. Swanna just looks off as a male, considering its appearance. Besides, Shiny Ducklett is pink
9947 REs....hopefully your next BQ shiny won't be that long.
Anyway, the only physical set for Swanna that I can think of is
~Dive (yes, this is its ONLY physical Water move)
~Brave Bird/Aerial Ace
~Return
~any filler move (Toxic/Tailwind, maybe?)