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If the wielder is in battle, it will be guaranteed the ability to flee so long as it isn't under the effects of full-trapping moves or abilities. This does not apply to trainer battles, where fleeing cannot occur. This does not allow escape from the trapping abilities Shadow Tag or Arena Trap, the moves Mean Look and Spider Web, or the trapping effects of moves such as Fire Spin and Whirlpool.
Has no use in link or Wi-Fi battles.
Found in Dream World