A shear wall can be erected between the columnar poles of the barn structure. This would require standard lightweight wood construction consisting of studs and plywood to form a monolithic wall. The key to a sturdy shear wall is its foundation, however, which must be accurately dug depending on the frost line of the location of the barn.
To make the pole connections rigid, you need to weld them. This is labor intensive and quite expensive when the point of a pole barn is to be economical. Specialized labor such as welding requires high pay because of the specialty equipment. Also, depending on the form of the structure and weather conditions, there may not be an opportunity to weld the barn on-site, which can be problematic.
Cross bracing is ideal for this type of structure. Simply use quarter-inch steel cable to cross brace one or two bays of the structure depending on the wind conditions of the site. This cable is available at most hardware stores and is simple to install by yourself with minimal time and effort.