It is just a collectors item ZERO effect.
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U can get it frm mahogany town mart for 9800 coins
Mahogany Town
You can't and you don't need one to get through the game but you can get one by using a cheat that gives you more than $999,999 but if you buy one, the only thing you can do with it is sell it for $628,000, which is a waste of money
When you are in violet city go then south and then there is a man, talk to him he says it cost 1,000,000 coins, but you can't carry that amount. The max amount of coins you can carry is 999,999.
Slowpoke cannot be holding a King's Rock in the wild on Pokemon Pearl and instead maybe holing the Lagging Tail item. However wild Poliwhirls now have a chance of holding it King's Rock. Wild Poliwhirls can be found in Route 225 with the Super Rod or on Routes 227 and 228 by surfing. Alternatively if you have a Pokemon with the Pick Up ability and at levels between 11 and 30 it has a 1% chance of picking up a King's Rock.