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When the wielder is first in the party, it is more likely that you will be prompted to enter battle against a wild Pokemon while fishing.
The only real user is Cradily, and while Cradily has a great niche, especially with sandstorm as prevalent as it is, you will not see very much of it, and as such will not be seen very much competitively. It is a nice ability on bulky sweepers though, as it can allow for a successful Baton Pass chain.
Found in Dream World