It is right across from the GameFreak HQ.
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Its an event pokemon in castelia city;~]
He is on the Northern Road of Castelia City
He is on the first floor of the building to the left on the street leading out of Castelia City towards Route 4 (the sand place)
Its available in Castelia City, and the Desert Resort. There will be a scientist it will ask witch Pokemon you have answer pansear
There is one in Castelia City and one in Icirrus City.