I need help picking my water type pokemon for my Moon team.

I'm really disappointed with the water types of this gen since they'rec all too slow.

Here's what I'm planning to use.

>Decidueye
>Salazzle
>Mudsdale
>Vikavolt
>Drampa

I won't use Golisopod since i'm using Vikavolt on my team, would prefer no type over laying.

I'd prefer using only Alolan mons.

so thoughts on Wishiwashi, Bruxish, or Tapu Fini?

I usually prefer not to use legendaries but are the Tapus technically legendaries?