Are you kidding? Someone who bore the stigmata and worked numerous miracles.
There is an excellent book about him by Ruffin. (But then you might not want to read it. Too much proof of how saintly Padre Pio really was!)
One who studies the scripture knows that Satan and his minions are perfectly capable of performing miracles...
1Sa 16:7 But the LORD said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the LORD seeth not as man seeth; for man looketh on the outward appearance, but the LORD looketh on the heart.
The fact is, no one knows...And that goes for any and all Saints who have passed on...I wouldn't pray to any of them...