[Meta thread] Lord Windos' PokeRole Adventure : Celadon City Vandels

[Dragonstrike]

....

My bless God no. Any pokemon but not a Gyarados! A Pokemon who have a base HP of 21!
Even more a Nuclear one!
I doomed D:
I want to run T.T I dont want to die horribly.

You've got two pokemon that can hit a 4x weakness with really strong moves.  It'll go down faster than you might expect since you can gang up on it.  Special Conditions and strong stat debuffs are also your friends since Gyarados can't clear any of them on its own.

For reference, Mew had 30 HP and 5 Defense, and it took 4 Rounds to down her with 4 pokemon using primarily weaker Dark moves.  Buzzwole also had 108 HP and 5 Defense and also took 4 Rounds to take down using a bunch of really strong neutral attacks and a handful of x2 super effective ones.  One was a Boss, the other was Hard and was immediately after the ridiculousness of Beautifly and Shedinja (so it might as well have been a Boss)

You got this.