Question

Where to get amulet coin B2?

Answer 1

In Castelia City, from a man in the building on the far left, near the Castelia Gate.

http://bulbapedia.bulbagarden.net/wiki/Castelia_City#Items

Comments

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Answer 2

http://www.serebii.net/itemdex/amuletcoin.shtml

In castelia city