Not sure I understand, do you want the XY coordinates added to the attribute tables of point shapefiles for which you already have in WGS84? I think the Add XY coordinates tool should do this, probably in decimal degrees, automatically adding PointX and PointY fields.Also if you want to run that in batch, I think this tool will allow it...if you right-click on it in the toolbox and select Batch.Optionally, you could set up an iterator in a Model or if you prefer, feed a list (or list a directory) into a loop in a python script.