Yes there is;
Just use an item(such as a potion or healing item) on a Pokemon that it won't do anything on, and it will count as a turn. I know because I've done this many, many times.
If you are in an online battle, you cannot do this trick. If this is the case, just do what sumwun said and keep switching out over and over again.
Hope I helped! ;)
EDIT: This trick does not work with certain games; it does not work for Gen 3 or 4 and in Gen 1 and 2 you can just use the Pokeflute to waist a turn. This trick will work for any game Gen 5 or higher.