When you download timetables for students in bulk, the PDFs will be downloaded together into one file.
There isn't a way to send students their timetables in bulk. You would need to download each student's timetable and then send it via an email attachment one at a time.
The other option is to enable the Student Portal at your school for students to log into. They can view their full calendar timetable through the portal. You can read more about the Student Portal and enabling it for your school here.