Taen and Holon (Contains spoilers)

I jusst defeated Taen, in postgame, and he went and talked with Reukra and everything. Afterwards I got Zekrom and Reshiram. Now I’ve seen a couple of LP where the next step is going to Suntouched city and leaving for the Holon Region. But when I go to Suntouched City, the professor isn’t there. Is there a step I’ve missed???

Did you receive a call from the professor before hand?

No, but I figured it out now. I never did the first Scientist club mission… So I just did that and now it’s working