Did Ash tell everyone about the Coastline Gym as he promised?

Question

Ash, Misty and Dorian reunite with their Pokémon, and Dorian comments again on Psyduck, who merely looks confused at the compliment. Misty says that it's a shame that they couldn't finish their battle, but Dorian says that had she used Psyduck, she would have easily won. With the score at 1-1, the two decide to call it a draw. Dorian tells Misty that he thinks she's every bit as good as her sisters, and Ash and Misty both say how much they've learned from being there. Ash promises to tell everyone about the Coastline Gym when they reach the Silver Conference. Dorian thanks them sincerely, and promises to pass on how well Misty is doing to her sisters when he visits Cerulean City. The group bid farewell to Dorian and continue on their way.

Answer 1

>Although the Gym is unofficial, Dorian is hoping that by word of mouth it will become more popular. In fact, after Ash and his friends visited the Gym, they promised they would tell everyone at the Silver Conference about it. However, it hasn't been mentioned since then.

So, the Coastline Gym is probably as unpopular as it was back then. :3

Hope I helped. :)
Source