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OP the shiny rate with masuda method is 1/445 with shiny charm.
You are doing the fastest in-game method that isn't SOS chaining, which is shit anyway if you want them to likely be competitively viable ones.
But realistically for competitive ones you have:
1, what you're doing at the moment
2, RNG egg abuse which will require at least homebrew to view your current seed on PKHeX to do easily if you would rather have the feeling of a legitimate game-generated shiny.
or 3, just inject lol.
pick wisely
