I prefer to battle people I know, but I have been using pokemon showdown a lot lately for little cup http://pokemonshowdown.com/
Have you used it before?
I find it works better on mozilla vs microsoft inernet explorer.
hardy is the first nature on the drop down list, so I wonder if either
a) you left it blank or
b) you chose one, but accidentally changed it back to hardy. those drop downs I have accidentally changed moves using the wheel on my mouse