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Because that's where the TM for Earthquake is and I need it for one of my Pokemon.

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Use Dig m8

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No, you cannot.

You can only get to route 15 once you beat the game. You have to cross the Marvelous bridge which is inaccessible until after you beat the E4.

>In Black 2 and White 2, the bridge is inaccessible until the Elite Four is defeated. Afterwards, if the player brings a Lunar Wing to the center of the bridge, a Cresselia will appear.

Source (that and I remember form playing it)
Hope I helped. :]

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that source is about Black 1, not 2
Ah I took too long editing it
Wouldnt you be able to get to it from the other side? (from Undella)