Where in Castelia city is the Eviolite?

Question

Everywhere I read it tells me the Eviolite is in Castelia, but I've been looking around the city and I can't find it.

can I get like, detailed directions?

Answer 1

In Black and White, the Evolite can be found in the building closest to Route 4 on the main floor. The scientist will give it to you if you have seen 25 or more Pokémon in your Pokédex.

According to this source, it is the same in BW2, but with seeing 40 different Pokemon.

Source: Experience (with photos below).

Answer 2

According to Bulbapedia the Eviolite ( ) is in Castelia City and you can receive it from a scientist in the Battle Company if over 25 Pokémon have been seen in the Pokédex .If you don't know where Battle Company this map should help you.

Map from Bulbapedia.

Source:Bulbapedia