When inside a building, you can't use any Ride Pokémon. However, if you try going to Poké Pelago, your character will perform the animation for the Escape Rope with the sound, the screen will blackout, and then the clip will play for the Charizard Glide. When exiting Poké Pelago, you'll be in the same exact spot you started.
Nothing game breaking, but I was definitely confused. Is this to prevent Charizard from crashing through the roof? How did your character get back inside? Will I ever find a shiny?