There has been alot of debates about this, there is no benco city. Unless there is,... :D
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Go to Celaceon City northeast from hearthome
it is not realy possible to get there
In Pokemon Diamond\Pearl, you go to the Veilstone City Gym. In Pokemon Platinum, you go to the Hearthome City Gym.
Go to the GTS in Jublife City.
Jubilife city. go to the left of the Pokemon trainers school.