Google Gemini Answer
Gardevoir'sGXattack,PsychicRevelation,isthemostpowerfulmoveatyourdisposal.ForasinglePsychicEnergy,itcando30damageplusanadditional30foreachEnergyattachedtoyouropponent'sActivePokémon.ThisisgreatfortakingdownPokemonwithhugeamountsofEnergyattachedtothem.
Gardevoir'sAbility,GracefulEnergy,isalsoveryuseful.ThisAbilityletsyousearchyourdeckforaPsychicEnergycardandattachittooneofyourPokémon.ThiscanhelpyoutopowerupGardevoir'sattacksquicklyandeasily.
Gardevoir'sWeakness,Fairytype,canbeapain,buttherearewaystoworkaroundit.OnewayistousePokémonwiththeSteeltype,whichcanresistFairyattacks.AnotherwayistousePokémonwiththePsychictype,whichcandealsuperdamagetoFairytypes.
HerearesometipsforusingGardevoireffectively: