Which is correct: shot or shooted? Where and when is the form shooted used?
Shooted is an obsolete, nonstandard simple past tense and past participle of shoot. (source)
You should not use this form. Shot is proper.
It's still used sometimes, but it's really obsolete. Example:
He took his gun and shooted people just like, from one block of LePlaza and two blocks from the main police station of PAP.
— The Huffington Post, “Georgianne Nienaber: Senator Leahy Calls for Freeze on Haiti Aid, Clinton Silent, Palin Visits Camps”
It's also common to use shooted when asking:
Have you ever shooted a gun?
Although it's also improper and the correct term is "Have you ever shot a gun?"