The way you can get zangoose in Pokemon heartgold is in the safari zone.
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Safari Zone.
Zangoose does not appear in Pokemon sapphire, but you CAN get it. To get it, you must trade Pokemon with your friend if your friend has Pokemon ruby which is the only game you can get zangoose in. Or you can just buy Pokemon ruby.
Zangoose is only found in Pokemon Ruby, which means you have to trade it from Ruby or from someone who has one.
Zangoose is #335 in the national pokedex, and it is a Normal type Pokemon.
you catch zangoose in route 208 after getting national pokedex