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Pokemon Black 2-White2 Walkthrough: Tuning Up Village Bridge
http://www.rarityguide.com/articles/articles/5386/1/Pokemon-Black-2-White2-Walkthrough-Tuning-Up-Village-Bridge/Page1.html
By Nick M. Facer
Published on 08/6/2013
 
There's something neat about an area that lets you choose which instruments are going to participate in its music.

Before poking around peoples' homes, though, head to the South side of the bridge and step out onto the tennis court.  The near side holds a tennis player waiting for a match- a pokemon match, that is.

Battle: Smasher Lizzy (4400 Poke)
Opponent: Whimsicott Lv 44

A Carbos vitamin is sitting by the bench on the north side of the tennis court, right near where the other pokemon-using tennis player is pacing.

Battle: Smasher Amy (4400 Poke)
Opponent: Lilligant Lv 44

The far side of the tennis court grants you access to the under-bridge area, which you can use to head North or cross/surf in the stream under the bridge.

North of the bridge on this side is another battle waiting for you.

Battle: Artist Gough (2016 Poke)
Opponent: Sunflora Lv 42

Past him to the North is an area with dark grass, where you can pick up a hidden Big Mushroom just as you enter.  At the far side of the grass is a Rare Candy, easily spotted.  A man in the middle of the grassy area can be talked to in order to add a flute line to the music of the Village Bridge area.