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The card text is very correct on the card mechanics; "Atomic Firefly" has to be face-up BEFORE the attack is declared.
(1) When this face-up card on the field attacks or is attacked and it is destroyed as a result of battle, the player who destroyed it takes 1000 points of damage.
"Atomic Firefly"'s effect activates in the Graveyard when "Atomic Firefly" is sent to the Graveyard at the end of the attack, so "Skill Drain" will not negate its effect.
The (1) Trigger Effect is mandatory, it activates & resolves in the GY / banished.
You can use "Barrel Behind the Door" against "Atomic Firefly"'s effect.
This effect activates in Substep 7 – End of the Damage Step.
You can use "Barrel Behind the Door" against the effect of "Atomic Firefly".
The effect of "Atomic Firefly" activates in the GY when "Atomic Firefly" is sent to the GY at the end of the attack, so "Skill Drain" will not negate its effect.