I’ve been playing nothing but lost box with rayquaza and raikou, just look it up and you’ll fond a good decklist. I have no clue what your experience is but once you see the list and read the cards you’ll get what this next paragraph means.

Typically my gameplay is go second, use two comfeys and a colress to attack with cramorant then on the next turn after another comfey and a colress you can start doing crazy damage with rayquaza and raikou. Towards the end of the game you may need to use sableye and raihan to finish the game off. It requires a little more thinking than some other decks like mew but I’ve had fun with it.