You find a soothe bell at the Pokemon mansion
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After battling with togepi constantly it will evolve into togetic now to make things easy have it hold soothe bell while battling trainers and to make things easier buy protein, iron, zinc, carbos, calcium and hp up and give them all to togepi to make it more friendly. To get a soothe bell first get the itemfinder then go to Pokemon tower then head upstairs until you reach where mr fuji used to be stand in the exact spot where he was and use the itemfinder you will dig up the soothe bell.
You receive the soothe bell after defeating the 5 kimono girls, at some point throughout the game you will bump into each one of them and are required to help them. Towards the end of the game you will have to visit the city where they are and will battle them one after the other until either you fail or they are all defeated, once they are all defeated you will receive the soothe bell. - quick side note- The soothe bell in only acquirable in soulsilver in heartgold you receive the rainbow wing after defeating the kimono girls which allows you access to catch HoHo.
I think it makes the Pokemon that hold it become happy more easily but im not sure I also heard that it is useful to chansey as it can help chansey evolve to blissey. That's not all, the most cool is that if your Pokemon have it equipped, it gains hp when it hit opponent.
Either put it in the front of your party and battle thousands of trainers or wild Pokemon, OR An easier way is to get the Soothe Bell and just run back and forth until you gain your pokemons Happiness. Every step while holding soothe bell makes it happier. And in HG/SS just walking with you also raises happiness. But don't let it faint or put it in your Box because it will lose all happiness.
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.