These are my Pokemon for double battles:
Swampert Moves:Earthquake,Ice beam,Rain dance and Waterfall.
Ferrothorn.Moves:Seed bomb,Iron head,Power whip and Protect.
Hydreigion.Moves:Flamethrower,Dragon pulse,Dark pulse and Draco meteor.
Machamp.Moves:Stone edge,Dynamic punch(ability no guard)Cross chop and protect.
I was thinking of going with swampert and ferro and use rain dance for ferro's fire weakness.
Hydreigon is for its sp attack and machamp is for its attack.
My other Pokemon are Charizard,Salamence,Venusaur,Metagross.
Please give your suggestions if there is any way of improving this.