If I use Tatsugiri ex's "Surprise Pump" attack against my opponent's Kecleon with "Expert Hider" Ability and they flip Heads, does it do 100 damage or no damage?
Surprise Pump will do 100 damage. The attack ignores the damage reduction because Expert Hider is an effect.
Source: Surging Sparks FAQ; TPCi Rules Team (2024-11-07)