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https://pokemonblog.com/2021/01/07/complete-the-sinnoh-collection-challenge-during-sinnoh-celebration-event-by-catching-turtwig-chimchar-piplup-cranidos-shieldon-combee-buizel-shadow-stunky-and-shadow-snover-to-receive-stardust/
Complete the Sinnoh Collection Challenge during Sinnoh Celebration event by catching Turtwig, Chimchar, Piplup, Cranidos, Shieldon, Combee, Buizel, Shadow Stunky and Shadow Snover to receive Stardust, a Magnetic Lure and 15 Ultra Balls in Pokémon GO