Use Zacian V's Intrepid Sword ability combined with Oranguru (for at least 1 energy guaranteed) on your first turn or two (to gain cards and energy attachment), and get Bronzong and a Dialga VSTAR into play. Use Bronzong's Metal Transfer ability to shift energy around (steal it from the Zacian V) in order to get the perfect amount of damage necessary for the KO from Dialga VSTAR's Metal Blast attack.
Most trainers are just for basic consistancy, and Adaman really helps. There have been times where I've literally just used Adaman to discard 2 metal energy and search for 2 Metal Saucer, reattach the metal energy from the discard pile, shift them to my active Dialga VSTAR, and then deal another 80 damage with Metal Blast (120 if I attach one for turn).
Star Chronos is AMAZING in a pinch, or for a huge boost near the start of the game. Use Metal Transfer (Bronzong's ability) to ensure that you only just knock out your opponent's active Pokémon, so that if your active Dialga VSTAR is knocked out you can send in another with enough energy.
Zamazenta V's Dauntless shield for against VMAXes, and Greninja helps with Metal Saucer.
Any suggestions are perfectly welcome, and don't worry about them sounding nice. I am aware of Ho-Oh V, however, but I prefer Zacian V (at least right now) due to its added flexibility, as it draws you cards and can attack for less enegry if needed.
Yoga Loop because why not :)
Thank you Lycanrock-Your Mom for the advice!