Who: Meowth, Pinsir, Ponyta, Raticate, Rhyhorn, Venonat
You’ll find them in Little Tokyo, which has dozens of PokéStops.
Who: Seel, Shellder, Goldeen, Horsea, Magikarp, Tentacool
The Long Beach boardwalk and Downtown attracts several rare types, including water Pokémon like Poliwag, Poliwhirl, and Dratini.
Overall pro tip: Though unproven officially, it’s thought that rare types spawn where there are a lot of players, which is why high-density PokéSpots like tourist destinations, theme parks (Disneyland, Universal Studios, Six Flags, Knott's) and malls (Grove, American in Glendale) have higher rare sightings.