The drop rate in f the shiny Pokemon is the same as it was 2 weeks ago or worst. This week alone I have done 3 normal 50 waves, 2 20 Legendary waves, 3 38 Legendary waves, and 1 50 wave Legendary completion and not 1 single Shiny. Stop BS people.
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Pretty sure they didn't say anything about increasing the "shiny" weapon drops, just weapon drops in general.