is hydro pump 100% accurate in the rain?

what is a good starmie set?

if i have psychic, surf, thunderbolt, and ice beam should i get rid of psychic for rapid spin?

In the following order:

No, its accuracy is still 80.

No, you should not get rid of Psychic for Rapid Spin. Either keep it or go for Recover. Boltbeam is a very powerful thing.
- DNA

no, it dosent have the stats for recover and i need a spinner!

Starmie is considered one of the best Rapid Spinners, so yes keep it if you need a spinner.

If he got rid of Psychic for Rapid Spin, he'd still have BoltBeam...and IIRC, the Starmie spinner set has Surf/Bolt/Beam/Rapid Spin...

Rapid Spin on Starmie is a must.

Sorry, I forgot that Starmie could double as a spinner. Ignore my comment then, people. (But still, Recover is a nifty move with 20 PP.)
- DNA

what evs then

252 sp atk/ 252 spd

yep, and Timid.

sorry to be meticulous but recover only has 10 pp in d/p. I still agree that recover should be put on the starmie, though.

Starmie, as a typical sweeper, doesn't have the best defenses and can't withstand to many hits. Chances are you'll be taking at least 1/2 damage from any attack you get (except Bliss Seismic Toss, but you can't get past Bliss anyway without a stat boosting move). Therefore, Recover is probably not the best choice for a Starmie, although some people do use it. If you choose to use it, then PP Up Recover to 16 PP.

true. it might be a usefull move though if you elect to keep confuse ray on starmie. then you can gamble a bit and use it while the target is confused. but i guess that would be straying from the whole point of starmie being a sweeper. point taken

no....why timid? i dont want to rebreed again

Timid or else it will get outsped.
Give it life orb and it'll have plenty to OHKO most things.

when is it the best time to use rapid spin?

Uh, when they use Stealth Rock/Toxic Spikes/Spikes ...

then they have a chance to hit you with an attack

but the spikes and rocks are worse