Other known variants
BlindsideThis attack does 100 damage to 1 of your opponent's Pokémon that has any damage counters on it. (Don't apply Weakness and Resistance for Benched Pokémon.)
The Pokémon this card is attached to can use the attack on this card. (You still need the necessary Energy to use this attack.) If this card is attached to 1 of your Pokémon, discard it at the end of your turn.
Can Cramorant with the "Lost Provisions" Ability use an attack from a Technical Machine such as TM:Blindside for no energy cost if there are 4 cards in the Lost Zone?
Yes, that will work.
For Mandibuzz's "Blindside" attack, who chooses which of the opponent's Pokemon receives the damage?
The attacking player chooses which of the opponent's Pokemon receives damage from the attack, but remember the opponent's Pokemon must already have damage counters on it first.