Flying
{1}{R}: Forgestoker Dragon deals 1 damage to target creature. That creature can't block this combat. Activate only if Forgestoker Dragon is attacking.
Forgestoker Dragon’s activated ability can target any creature, not just creatures controlled by the defending player or ones that could block.
If you don’t want the target creature to be able to block, Forgestoker Dragon’s activated ability must be activated during the declare attackers step.