Good places would be the ones that have a lot of bug or ice pokemon, but the best would be somewhere with steel types.
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Mt. Silver or the Pokemon league
probly at the pokemon leuge
Some people will argue with me but i think the best place to train is at the Pokemon lugue you can battle them over and over again
victory road is a pretty good place
In route 1 thas the best way to train pokemon if your pokemon lvl `10