How can I create underground bases in platinum ?

Question

Can I create more than 1?how can I create it if I haven't got all eight badges?how I take flags from other trainers ?

Answer 1

To access them, you need to get a Drill from the old man in Eterna City. This Drill is one use so you have to be careful. However you can pick up another one from the hikers for a price

So each drill will only make one base, but there is more than one drill available.