This is actually a very broad ruling question. I'm just using this very specific example to hopefully understand better how other interactions work in the game.
The two cards in question:
Drampa GX: https://bulbapedia.bulbagarden.net/wiki/Drampa-GX_(Guardians_Rising_115)
Splash Energy: https://bulbapedia.bulbagarden.net/wiki/Splash_Energy_(BREAKpoint_113)
Situation:
It's my turn, and I have a Drampa GX active with one Psychic Energy attached.
My opponent has a Greninja BREAK active with 150 dmg and a Splash Energy attached.
I use Righteous Edge to do 20 dmg, knocking out my opponent's active.
Specific Question:
When the Greninja BREAK is knocked out, does the effect of Righteous Edge discard the Splash Energy BEFORE my opponent can put the evolution into his hand?
Broad Question:
How is the attack phase processed?
How I THINK it works:
1) I declare my attack, Righteous Edge.
2) Drampa GX does 20 damage to Greninja BREAK.
3) Any effects of attacks are processed, therefore the Splash Energy is discarded.
4) Check for KOs. In this case, Greninja BREAK has 170 damage, so it is knocked out, sending the entire evolution line to the discard pile.
Thanks in advance.
The two cards in question:
Drampa GX: https://bulbapedia.bulbagarden.net/wiki/Drampa-GX_(Guardians_Rising_115)
Splash Energy: https://bulbapedia.bulbagarden.net/wiki/Splash_Energy_(BREAKpoint_113)
Situation:
It's my turn, and I have a Drampa GX active with one Psychic Energy attached.
My opponent has a Greninja BREAK active with 150 dmg and a Splash Energy attached.
I use Righteous Edge to do 20 dmg, knocking out my opponent's active.
Specific Question:
When the Greninja BREAK is knocked out, does the effect of Righteous Edge discard the Splash Energy BEFORE my opponent can put the evolution into his hand?
Broad Question:
How is the attack phase processed?
How I THINK it works:
1) I declare my attack, Righteous Edge.
2) Drampa GX does 20 damage to Greninja BREAK.
3) Any effects of attacks are processed, therefore the Splash Energy is discarded.
4) Check for KOs. In this case, Greninja BREAK has 170 damage, so it is knocked out, sending the entire evolution line to the discard pile.
Thanks in advance.