You can't get it in the silver version only heart gold
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you trade it from another Pokemon gameyou can not get mankey on heart gold or soul silver yoU have to get him by migrating
same as growlithe, gligar, mankey and phanpy, you can't get phanpy in Pokemon soul silver, only available in Pokemon heart gold.
you can not get regirock in soul silver but in platinum you can in a special event.
MT. Silver
you can find a mankey on route 1 and 2