Pokémon GO is celebrating a major milestone with the 10th Anniversary Party event, which runs from July 4 to July 6. The event introduces Gimmighoul holding a 10th anniversary coin, available through Coin Bags and Golden Lure Modules, with lucky Trainers even able to encounter a Shiny version. Players can also enjoy 4x XP and 4x Stardust for catching Pokémon, increased Shiny rates for event-themed wild encounters and special Field Research. Fan-favorite costumed Pokémon such as Pikachu, Eevee and Wurmple will return, making this a festive celebration of a decade of Pokémon GO adventures.
Source: Official Pokémon GO blog
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