I wanna try to use a Donphan.

Here's what i'm thinking.

EV: Max out HP and split the rest between def and atk.

teach it sand storm so that it's sand veil gives it evasion as well as sandstorm being sandstorm. I figured i could use double team to then raise the evasion more. then teach it earthquake/poison jab/stone edge/giga impact

will this work? will it be too easy for a special defensive pokemon to take it out?