If you mean when you have to fight Team Rocket at the Radio Tower, at the first floor the guy blocking the way up to the second floor.
If so, what you need to do is go underground you will see a Team Rocket grunt there or someone different. When you walk past them they will say something similar to this "Put on this costume" It will be a Team Rocket costume. Then go back to that guy who was blocking your way and then talk to him, you will then see your rival, he will say a few things, then he will say what ever your characters name is then the team rocket grunt will say a few things then you have to battle the grunt.
Chat with our AI personalities
Beat team rocket in the radio tower in goldenrod city
when you beat the people in the poke mart basement and (optional) the mohagony gym, go to goldenrod and beat team rocket in the underground and radio tower. the guy should move after you disband team rocket.
You have to complete the Team Rocket HQ mission at Mahogany Town and win the Mahogany Gym Badge. Then you go to the Goldenrod Radio Tower then you see that the officer is gone because Team Rocket wants to run the radio tower.
Beat 7 GYM leaders then Prof Elm will call you saying something wrong with the goldenrod tower then defeat Team Rockets scheme and when you do you can pass the guy
You need to first buy a RageCandyBar from him, and then go to the Goldenrod Radio Tower and beat up Team Rocket (as well as the Team Rocket executive there) in order to get the person on Route 44 to disappear.