A. If you wanted a source, I just used a Graveler without an Eviolite, and calced the defense, then used the same Graveler w/o Eviolite and the defense was much lower the second time.
B. Questions concerning Pokemon Online as a program should be directed to the PO forums, NOT our site. This has been said by Pokemaster before, not some random crap I made up.
( In case you were wondering :P )