There is a certain time of year where you can catch fish. The monthly fish and bug guide found on the Animal Crossing Community can tell you if sharks are around the current month.
If you see a big shadow of a fish in the sea of your town, it could be a shark. You could be lucky, and it may be a shark, but it could just be another big fish. Keep on trying!
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you catch them in the ocean in June onwards
yes you can catch a Manaphy on emerald. (if you have a game shark)
shark
go to walmart and buy a $20. game shark and fight Cynthia and make sure you can catch other trainers Pokemon and catch hers
you cannot catch him unless you use a game shark but you can trade it fromfire red or leaf after you beat the game