G-Max Steelsurge inflicts damage and sets an entry hazard around the target Pokémon. Pokémon on the target's field receive damage upon switching in. The amount of damage inflicted upon switching in is affected by the effectiveness of Steel against the target. This effect does not stack. It does not damage Pokémon with the Ability Magic Guard. Rapid Spin removes the hazard from the user's side of the field if it affects its target; Defog removes the hazard's effect from both sides of the field.
The damage is taken from the victim's maximum HP, and follows:
Type effectiveness
Damage (Max. HP)
0.25×
3.125%
0.5×
6.25%
1×
12.5%
2×
25%
4×
50%
The damage is rounded down, but if the calculation returns zero, it will do 1 HP damage.
Applies the Steel Damage Field effect to the opponents' field of play. (Steel Damage Field: The sync pairs will take Steel-type damage whenever they take an action.)