Whether you chump block with it, watch it get wrapped up in a Cyclonic Rift, or it becomes collateral damage of a Toxic Deluge, Boreas Charger has actually put in some solid work in my mono-white decks, as well as occasional work in non-green multicolor builds
Its a small expansion, but there are some very popular cards to be found here
For Rocky Helmet, the opponent would have to think very carefully if getting some early attacks would be worth putting their currently active Pokmon into one-hit knockout (OHKO) range, thus denying an easy way of just attacking your currently active Pokmon
Amethyst/Steel Starter Deck Starter Deck Strategy With this deck you want to play as many characters as you can , aiming to keep them alive for when they can be used
Cut Your Losses Mill 75% of someones library or half of two players libraries