I'm just beginning getting into Pokemon, and it's been two years, so I'm currently unaware of the meta for trainers and such thing. I'm very opening to suggestions and alterations, but I'd like to keep the Pokemon lineup as similar as possible!
I'd kind of like to fit in a Reversal Trigger or two. I'd also consider switching the Victini EX with a Heatran EX.
When attached to a non ex pokemon. The silver mirror prevents all effects including damage to that pokemon.
Thus a pokemon equipped with a silver mirror, is completely immune to almost your entire deck. Aside from victini ex. Though if the pokemon has the safe guard ability. It is completely immune to you.
Also i am going to assume that is the fire iteration of chandelure. Best bet would be to drop muk completely, with espeon. Remove all psychic energy. Replace espeon with Leafeon, who uses colorless energy to attack. Increase the fire energy count and increase the count of your chandelure line.
Other than that i would have to take a better look at your deck list later.
If i were you i would stick with 12-14 pokemon max. Some decks use like 17-20. But they are usually to support the overall strategy.
If anything i would suggest ninetales over Volcarona and eevee. Its catcher ability is great. When combined with hypnotoxic laser it can for 120 if you flip heads then with virbank thats 150. All for 1 energy.
Maybe 3-1-3 Chandalure with 4 rare candy. 2-2 Ninetails, and your 2 Exs if you want them.
Pick up some rare candys. You need them with a 2 Step pokemon. Put at least the same amount as you have Chandelures. But 4 is always a good play. Drop Cilan, shadow triad, and plasma grunt. Cilan grabs 3 energy, cool, but you can only play 1 of those and the other 2 just sit in your hand for the turn. Shadow Triad only gets back plasma stuff, not great, better to draw more cards. Plasma grunt is just bad, dont play it.
Play more Juniper, Play more N, and maybe even colress or bianca.