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https://pokemonblog.com/2020/09/14/go-battle-league-season-4-now-underway-in-pokemon-go-with-the-great-league-format-until-september-28-at-1-p-m-pdt/
GO Battle League Season 4 now underway in Pokémon GO with the Great League format until September 28 at 1 p.m. PDT