Seaking Catching Day (Japanese: 釣り大会Fishing Tournament) is an anime-exclusive competition held annually at a lake in the Johtoregion. It was featured in Hook, Line, and Stinker.
The Seaking Catching Day is a fishing competition to see who can capture the largest Seaking. Contestants may use any rod, reel, or lure they like and may capture as many Seaking as they like—but only one may be entered in the competition and it must be captured using a Lake Ball. Competitors can also have one of their own Pokémon registered to assist them in their captures. The first prize winner gets a trophy, as well as a year's supply of chocolate candy.