What do i do now?

Where do i go after Taen moves to the other reigon, after beating zygard and getting reshiram and zekrom, what do i do now?

Did you already finish Holon?

I heard Holon was this other region, how to i get to it?

Go to suntouched subway after helping the scientists in Koril town and defeating the timeless.

Thanks, i havent done the scientist thing yet