I do not know if this has been requested: in gen 2 originals there is a bug that lowers the shiny rate to 1/64 when breeding with a shiny ditto, due to how DVs pass down (with non ditto shiny parent the rates differ, the 1/64 only applies to babies born the opposite gender of the shiny parent i.e. it would be 1/128 with 1 shiny non ditto parent on a pokemon with 50:50 gender ratio). Would be great if this was added in, thank you!
P.S. parents that share too similar DVs cannot breed in gen 2, so 2 shiny parents will never produce eggs (for those curious).