While it is not initially elaborated on how they are useful against him, it is clear that the stones contain magicin the Magical Citadel of Endymion, one of their common applications is to be a Fantastic Light Source
There are ways around it, discard the tool, not attacking (place damage counters) and Lysandre
Weakness: Lightning (x2) Resistance: none Retreat: 1 Shuffle up to 3 [W] Pokemon and up to 3 Basic [W] Energy cards from your discard pile into your deck
Even better, its as accessible as advertised, whether players are learning alongside an adult for guidance, teaching themselves, or playing with a friend or sibling
That notwithstanding, the fact that the patch notes include two Unix timestamps rather than a more user-friendly date format indicates that this leak either came from a Pokemon TCG Pocket datamine or the game's own website
If its summoned using an Xyz Monster as material, the player can destroy as many level 7 or lower monsters the opponent has as possible, then inflict 1000 damage for every monster destroyed