From Bulbapedia, the community-driven Pokémon encyclopedia.
The Sinnoh Star is the Sinnoh region's main newspaper in the anime. It appeared in If the Scarf Fits, Wear It!. The Sinnoh Star has been called unreliable, as some of its articles have been fake.
Brock reading about the Lustrous events in the Sinnoh Star
In If the Scarf Fits, Wear It!, Team Rocket disguised themselves as reporters of the Sinnoh Star, trying to figure out the mystery of the flying scarf monster.
The Sinnoh Star has also reported the events of the Lustrous Orb and the Celestic Town Historical Research Center from Losing Its Lustrous! and Double Team Turnover!.