Beast Energy {*} - Pokémon Rulings Compendium

If my Beast Energy {*} gets discarded while my opponent has Dusknoir's "Spectral Breach" Ability in effect, does it still go to the Lost Zone?: Yes, Spectral Breach does not affect the Prism Star Rule.

Source: TPCi Rules Team (2020-11-12)

If Blacephalon GX uses its "Mind Blown" attack to discard a Beast Energy as one of the Fire Energy discarded, does it still get the +30 damage bonus from Beast Energy?: Yes, it does. The energy cards are chosen, then Damage is calculated before the cards are sent to the Lost Zone.

Source: TPCi Rules Team (2018-11-01)

If I use Guzzlord GX's "Eat Sloppily" attack and discard a Beast Energy {*} card, would it get attached to the Guzzlord GX, or would it go straight to the Lost Zone because it was discarded?: When "discarding the top 5 cards of your deck", any revealed Energy cards get attached to Guzzlord GX immediately, before they reach the Discard Pile. Therefore, Beast Energy {*} gets attached to Guzzlord GX rather than going to the Discard Pile or Lost Zone.

Source: TPCi Rules Team (2018-05-31)