Powering Up Pokemon For Gym Battles and Raids.

I am trying to figure out who to power up for Gym/Raid Battles.

I currently have a

100% Espeon CP131 - Confusion/Psychic(TM change for Psychic)

100% Flareon CP479 - Ember/Fireblast(Reroll on both attacks)

100% Venasaur CP1467 - RL/SB(Good Attacks)

87% Dragonite - Steel Wing/Dragon Claw - Would it be good to re-roll my quick attack? For a Dragon Tail/Dragon Claw?