Hello, I'm currently lost.

After the 4th badge at Celadon and whipping the rocket hideout below the casino (I felt like that hideout was rushed, there wasn't much fight nor puzzle) , you got a call from the LT. Surge asking about suspicious activity and you promise to help but the dialogue don't hint at any objectives. Since I kinda remember Gen 1 I've went to the ghost tower to free the guy but he just disappeared afterward and still isn't in his house. Without guidance, I decided to go beat the next gym. After beating Kogo, LT. Surge called me again and I told him koga was suspicious. But then I didn't really knew where to go. I went to Saffron city since the borderguard would finally let me go through. I' ve beat team rocket at Sylp Co. (the 1 vs too many rocket was an amazing fight. Sadly I would have expected a bit of challenge afterward, the whole building is empty. You just go 4 floor up with no one to battle. ) I've beat Giovanni and receive a second master ball from the director. While exiting Sylph. Co I've go no call so I decided to challenge the gym and got no guidance afterwards either. At that point I decided to go for the seventh badge, got it, and that's it. No guidance aswell. 

The things is the labo at Cinnabar Island is still closed by a scientist, the eighth badge is still closed and same about the powerplant near rock tunel. 

Am I supposed to go to jotho before getting the eight badge?  

I would suggest to add a bit more guidance in the way of dialogue with Npc's at those points:

-at the first call from LT. Surge, would be great if he gave you a place to survey for suspicious activity. Guiding you to the ghost tower. 

-once you free the guy at the top, make you go to his house just like in the original game and he Will hint you about team rocket spoking about Koga, Because he heard them mention him. 

-after you beat Koga, maybe add a small dialog where you ask Koga if he heard of team Rocket and Koga will deny knowing anything. Then once exiting you got the second call and Surge could hint you to go to Saffron city telling you he asked the borderguard to let you go through. 

-once you've beat the 6th badge, would be nice to have a dialog from the gym master to tell you to get the next badge at Cinnabar island. 

-after beating the gym at Cinnabar Island. Could be great if the gym master tell you where to go. Like maybe tell you there is some suspicious activity in the lab on the island and you go there or something else? 

Maybe I missed something so don't hesitate to correct me if I am mistaken that there isn't much guidance at this part of the game.