You can still do the broken leg on if the weather cooperates with you. If nothing else, you could either try the weather control mod or revert back to episode 15 (while in that town's Pokemon Center) and try to use your computer's date to manipulate the weather.
I don't know if the Driftloon event can still be triggered after returning. Plus, windy weather has been bugged (along with all weather in general) in ep 16.
It might be possible to go outside the city, revert back to episode 15, manipulate the weather, do the full event, and then go outside the city to revert back. It might even be possible to get the railnet sticker this way.
If you do try this: Definitely have a backup of your file saved in another place, whether just somewhere else on your computer or maybe online!!! Also, don't revert back within Reborn City itself or you Will crash/corrupt your save file. Route one, the castle, or the Ice leader town's Pokemon center might do.