It's pretty obvious... EV train (I suggest EV Training in Defense)...
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Use items.
The way you can get zangoose in Pokemon heartgold is in the safari zone.
Yes the same way you get shiny Pokemon in the other Pokemon games is how you get shiny Pokemon in heartgold. There is a free shiny Pokemon in the lake of rage.
elite four again and again.worked for me
In route 1 thas the best way to train pokemon if your pokemon lvl `10