Originally Posted by WatchMeBeQuieter
Audino can ONLY be found in shaking grass :O
So you must have encountered shaking grass at least once :P Maybe you just didn't notice that it was shaking.
If you use a repel and run through grass for a little while, a shaking patch will invariably appear. It usually only takes about a minute and a half for me, but that length of time can and does fluctuate quite a bit.
You don't even have to run through the grass. Just run back and forth next to a patch of grass for a while and a patch of it will start shaking. It can take anywhere from five seconds to over a minute.