on haarvest moon 2 (the one on the island) how do you buuy animals??

If you're talking about Harvest Moon DS Island of Happiness, Maribelle will move in around Spring 12th, and you go to her shop to buy animals.
Go here, link , if you need more info on Island of Happiness. ;)

well...you got to wait till ganon,mirabel and vaughn move to the iland ganon will build the barn then toaro will give you a calf and you can by animals form mirabel.vauhn is the animal shiper he ship,s the animals to the iland