Split-Decision Path can only be obtained once from the Split-Decision Path. It can then be obtainable randomly from the Endless Path.
Hatching a Regidrago egg will not count towards your Shiny Chain. You can obtain a Shiny Regidrago Egg by completing 1000 levels in the Endless path, though you have an equal chance of obtaining one of the other Shiny Regi-Eggs you found int he other Paths as well.
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Regidrago does NOT evolve.