×2Infernal Reign
When you play this Pokémon from your hand to evolve 1 of your Pokémon during your turn, you may search your deck for up to 3 Basic 
Energy cards and attach them to your Pokémon in any way you like. Then, shuffle your deck.
Burning DarknessThis attack does 30 more damage for each Prize card your opponent has taken.
Tera
As long as this Pokémon is on your Bench, prevent all damage done to this Pokémon by attacks (both yours and your opponent’s).
Pokémon ex rule
When your Pokémon ex is Knocked Out, your opponent takes 2 Prize cards.
If I use Grand Tree to evolve from Charmander into Charmeleon and then into Charizard ex, can I use Charizard ex's "Infernal Reign" Ability or not?
No, you cannot use Infernal Reign because Charizard ex was not played from your hand to evolve Charmeleon.
If I use Rabsca's "Revival Blessing" attack to put Charizard ex onto my Bench, can I use the "Infernal Reign" Ability to search for and attach up to 3 Basic energy?
No you cannot, because Charizard ex is not being played from your hand to evolve 1 of your Pokemon.
If I use Rare Candy to evolve Charizard ex, can I use its "Infernal Reign" Ability to search for and attach up to 3 Basic energy?
Yes, because Charizard ex is still being played from your hand.
