If your looking to obtain loads of Pokemon Candy during your journey in order to make your Pokemon as strong as they possibly can be, then you, honestly, don't have to do all that much. You see, you will obtain loads of both Regular Candy and Pokemon Specific Candy simply by catching Wild Pokemon and transferring those your don't need. You will naturally obtain Pokemon Candy by doing this as you progress through the Main Story! Outside of catching and releasing Pokemon, you can also obtain Pokemon Candy by playing the Mini Game within Pokemon GO Park, as well as by walking with your Pokemon within the Poke Ball Plus (should you have purchased it).
Looking to obtain loads of Pokemon Candy with no effort at all? Check out these Guide Pages: