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?
Eevee nests and spawn locations
Dratini nests and spawn locations
Best Pokemon to beat Machamp
Best Pokemon to beat Snorlax
The best moveset ranking for Flareon
Lickitung nests and spawn locations