and their rarity according to a user survey (thanks to AirbenderProdigy on reddit for the research and image): Magikarp and Gyarados: The first Shiny Pokémon in Pokémon Go were Magikarp and ...
For every pokemon ... catching shiny pokemon before, but the previous version was extremely limited. It only worked with a fishing rod, so unless you want a ton of shiny Magikarp the earlier ...