ESV is the abbreviation for "Egg Shiny Value". It's a hidden individual 4 digit code attributed to every egg. With the help of a program called KeySAVᵉ these hidden codes can be read, which allows players to aim for specific shiny Pokémon easier. If a TSV (Trainer Shiny Value) matches an ESV (Egg Shiny Value), then the Pokémon inside the egg will hatch shiny. I suggest that you look up further information on the internet since the threads and guides there will be able to give you a much more detailed explanation.
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Max. Optimizer
BlazingBarrager
Okay thank you.
BlazingBarrager
Two questions:
Does KeySAV* require Homebrew or something on my 3DS?
Is this required when RNGing for a shiny Pokemon?
Does KeySAV* require Homebrew or something on my 3DS?
Is this required when RNGing for a shiny Pokemon?
Max. Optimizer
Yes, you need to have Homebrew on your 3DS in order to access your save file. Homebrew is also a prerequisite for RNG abuse in Gen 6 and Gen 7. Unfortunately I don't know anything about RNG though.