Gyarados is weak to [Electric] and [Rock] types, while being resistant to Fire, Water, Fighting, Ground, Bug and Steel types.
For the details of the update, tap the link below.
Some of Pokemon got their moves changed or removed | PokemonGo
What is DPS and EPS in Pokemon Go?
Dratini nests and spawn locations
Magmar nests and spawn locations
Eevee nests and spawn locations
Cubone nests and spawn locations