>>32084079From what I know, Gyro Ball is there only because it one-shots boosted Xerneas, which Iron Head can't do.
252+ Atk Aegislash-Shield Gyro Ball (113 BP) vs. 240 HP / 0 Def Xerneas: 470-554 (103.7 - 122.2%) -- guaranteed OHKO
252+ Atk Aegislash-Shield Iron Head vs. 240 HP / 0 Def Xerneas: 336-396 (74.1 - 87.4%) -- guaranteed 2HKO
>>32084100That's like asking what the point of a paralyzing move (Thunderbolt) is on Mega Manectric.
It's used for damage, not its secondary effect.