PokéBase - Pokémon Q&A
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I know that your rival's sister calls you, but when does she start calling you, also, do you get an item that allows you to call someone? If so, when?

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Mass outbreaks were largely expanded in Generation IV. Once the player attains the National Pokédex and has entered the Hall of Fame, a "swarm of Pokémon" will appear every day in a particular location, which changes the probability of finding the given Pokémon from 0% to 40%. Outbreaks last only one day and are random events. Information about mass outbreaks can be found in Sandgem Town by talking to Lucas/Dawn's sister or by watching the Sinnoh television.
Source: https://bulbapedia.bulbagarden.net/wiki/Mass_outbreak
I hope I've helped!

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