FAQ
If my opponent's Leader has 5000 power or less, can my Leader with the {Red-Haired Pirates} type have its base power set to 6000 until the end of my opponent's next End Phase?
No, you cannot.
One Piece TCG [OP17]

[Activate: Main] [Once Per Turn] If your opponent's Leader has 6000 power or more, set up to 1 of your DON!! cards as active. Then, your {Red-Haired Pirates} type Leader's base power becomes 6000 until the end of your opponent's next End Phase.
Rarity
C
Color
Green
Number
OP17-034_p1
Card Type
CHARACTER
Play Cost
5
Power
6000
Subtype(s)
Red-Haired Pirates
Attribute
Slash
No, you cannot.