Superior Energy Retrieval - Pokémon Rulings Compendium

Can I play Superior Energy Retrieval while my opponent has Toedscruel with the "Slime Mold Colony" Ability active?: If you do that you would discard two cards for Superior Energy Retrieval, but you would not get to retrieve any energy cards from your discard pile.

Source: TPCi Rules Team (2023-11-09)

If I already have four Fire Energy cards in my Discard Pile, can I use Superior Energy Retrieval to discard two Fire Energy cards from my hand and retrieve the other four from my Discard Pile?: Yes, you may retrieve the other four. The restriction is you cannot return any of the cards to your hand that you used to pay this card's cost.

Source: Plasma Freeze FAQ (2013-05-16), TPCi Rules Team (2013-05-16)