Question: are shiny magikarp still available?
Answer: No, sadly. Pokémon show up on Nearby or Sightings, but they look totally normal. It's only revealed as a Shiny when you tap on it and go to the catch screen. So, if you see a normal Magikarp or Pikachu on Nearby or Sightings, don't discount it — once you tap on it, it could be a Shiny.