Promos generally arrive in good surface condition since they ship outside booster packs, though storage wear can still accumulate
Theyre not only potent, but easy to slot into a multitude of decks - because rather than serving a specific playstyle, they benefit basically all of them
Chandra, Flameshaper comes in with enough loyalty to use any of its abilities the turn it comes down, and you cant say that about a lot of planeswalkers
But I would move Serperior into play if you are late in the game and you get a grass Pokemon on your bench that you really want to use right away, you could then use Serperior's Leaf Tornado and get the necessary energy cards on that Pokemon you just put on your bench and retreat Serperior the next turn for only one energy and put that Pokemon into play with the necessary energy cards on it
The main Item cards for Gardevoir EX are Fog Crystals for additional Energy cards, but Mysterious Tail can help get you a much-needed Rare Candy, Battle VIP Pass or even just a standard Ultra Ball, all of which are immensely useful in your composition