I heard there are different times for her show, but when exactly?
In order to play the quiz show, the player must listen to the Pokégear radio from 6 PM to midnight (in Generation IV, at 2 AM, 5 AM, 8 AM, 11 AM, 2 PM, 5 PM, 8 PM, and 11 PM). A secret password will be announced over the air, along with an invitation for listeners to come to the Goldenrod Radio Tower in Goldenrod City
Source Hope I helped.
