This is too strong!
Zeraora VSTAR can dunk upon lost box, and take multi-prize turns with ease, swinging the agme in your favour.
Zeraora VMAX can one-shot huge pokemon like Gardevoir ex, or Giratina VSTAR. Even better it can soften up big targets for Zeraora VSTAR.
Turn 1 attacks are uncommon, but can help win you the game when done correctly
Went 3-1-0 in a tournament if that helps, winning against lost box, Giratina VSTAR and Miraidon ex.
Some unfavourable match-ups are Giratina VSTAR when it reaches Star Requiem, so try to destroy all the comfeys fast. Gardevoir is also strong when it sets up, so try to take the game before they can bring out Zacian V for OHKOs.
Arven can be put in place of some of the less used cards like an escape rope, or a nest ball, however you mainly want to use research to draw through the deck.
Good luck with the list!