A WAY TO MAKE WISHIWASHI GOOD?

Hello everyone,,
Would using a pokemon that has Tailwind or trick room make having a wishiwashi on your team much better despite its HP?
Wishiwashis stats are insane, but due to it always going second, it's basically useless if your opponent hits it really good. However, if it were to always go first, like with trick room making it go first since its the slower pokemon, do you think WW would be a really good pokemon in a team like that?

If so, what item do we give it? Movesets?

Trick Room would be the way to go with Wishiwashi yeah. It's so incredibly slow that Tailwind's not gonna make it fast enough for you.

As far as items go, I guess you could try Choice Specs (or Band, but iirc this thing has a better special movepool than physical) to give it a lot of raw power, which is threatening if Trick Room is active. You could also forgo that extra power and run Sitrus Berry instead to try to keep it in Schooling form for longer. Though the extra power sounds better to me, since you'll probably use it as wallbreaker or cleaner, and after firing off some moves it's probably done its job and so doesn't care if it's dead or not Schooling anymore.

If playing singles, you also need to figure out how to both set up Trick Room and safely get Wishiwashi in asap.

Trick Room is definitely the way to go. It's just too slow for Tailwind to matter, as Nah said.
For ways to get it in, your best bets are probably moves like U-Turn or Parting Shot.

For your set, you'll want something like

Wishiwashi @Choice Specs
Ability: Schooling
EVs: 252 HP / 4 Def / 252 SpA
IVs: 1 Spe
Quiet Nature
- Hydro Pump
- Ice Beam/Earthquake
- U-Turn
- HP Grass

You could possibly also run Endeavour for some shenanigans but it's be very gimmicky.

Trick Room for the Win!!!!!! Its always nice watching random Pokemon get game play.