FAQ
Does the "When this Character becomes rested" effect activate when this Character attacks?
Yes, it does.
One Piece TCG [OP14]

Card Description
[Your Turn] When this Character becomes rested, up to 1 of your opponent's rested Characters with a cost of 4 or less will not become active in your opponent's next Refresh Phase.
Card Details
Rarity
C
Color
Green
Number
OP14-035
Card Type
CHARACTER
Play Cost
2
Power
2000
Subtype(s)
East Blue
Attribute
Slash
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Price History (USD)
Price Info
Market Price
$0.05
All time High (last 6 months)
$1.16
All time Low (last 6 months)
$0.05
Yes, it does.