It is available in Euro Star by General tires, and Sailun Atrezzo at Tyre Point, Metro. I personally think 185/65/R15 Vs 175/65/R15 will not make much difference for a 1.5L Aqua.
Brother, either buy from Tyre Point, Metro or from authorised dealers / distributors of tires only. Do not buy from abc "Shaskas" shops. Tire Point, Metro can be 110% trusted. Yes, prices may be slightly higher for the same item with same terms & conditions, when bought from market, however, if you buy from them, it is guaranteed that tire will be 110% genuine & original, non-smuggled, and with warranty. Even authorised dealers can not be 110% trusted.
Zafar Enterprises, Pakistan Rubber and Tire Company, and, Sheikh Brothers are official importers of Michelin, Bridgestone and Yokohama respectively. Please call them (their contact nos. are available on Internet as well as Pakwheels. I have myself shared their details & contact nos. in my Vitz thread. You can check) and ask them for their official dealers in your city or nearby area, and also ask them how to check and verify that tire is official? They will guide. Most of the times, official dealers also sell smuggled tires. Official tires have stickers of the company, and bead / sidewall of tire is perfect and not bend. They will clearly guide you how to check that tire is genuine and non-smuggled, or otherwise.
Instead of Yokohama Advan dB or Bluearth series, I would strongly urge to go for Michelin (Energy Saver +, or XM2 series) or Bridgestone (Ecopia series). These all are low rolling resistance tires series.
Yokohama should be your 3rd and last priority in these 03.
I hope, it helps. Thank you.