What Size of wire should I run for 250 feet run for 220 volt electrical?

The first paragraph below illustrates why you should hire a qualified electrician to do your electrical work and not take advice from just anyone.

"well i just the same install and it was recommended i go with a 3 conductor 2/0 aluminum AWG but to be safe with a voltage drop over that distance and a possible large draw for my equitment that i plan on getting in the future plus a rotary 3 phase 20 hp converter i upsized it to 3 conductor 1/0aluminum AWG"

(The next larger size wire would be a 3/0 not a 1/0! This is a good example of why unqualified people should not do electrical work, the answer below is correct).

To answer this question, the amperage of the load at the end of 200 feet has to be supplied.