Level 55.
Swanna can learn water gun, water sport, defog, wing attack, water pulse, aerial ace, bubblebeam, featherdance, aqua ring, air slash, roost, rain dance, tailwind, brave bird and hurricane
No. Ducklett evolves to Swanna at level 35, but can't evolve any further.
Ducklett evolves at level 35 into an Swanna.
In HeartGold, Dragonite can learn the move Hurricane by leveling up. It learns Hurricane at level 55.
Ducklett evolves into Swanna at level 35!
Give it an HM and yes
Azumarill is more powerful because it can learn powerful moves and has more evolutions which will make it stronger. But if you need a flying type Swanna is considerable.
Ducklett evolves into Swanna in Pokémon Black at Level 35.
Swanna doesn't evolve.
Ducklett can evolve into swanna starting at level 35. Ducklett's evolution condition is not different in other versions.
Swanna is #581 in the national pokedex, and it is a Water-Flying type Pokemon.
Well it seems useless to get another water type if you already have one, plus Swannas stats are really small, I suggest you get neither and get Archeos if you can.