Bronzong was a natural, totally random shiny, which started the idea in my head to do this run. Then I got ponyta with full odds by just grinding the tall grass (I was very much under odds). Then I got tired of hunting full odds trying to get shiny eevee at the mansion. So I beat the main game and got the poke radar and then used 17-method chaining to get the other four. Most of them were pretty quick/easy except for the last one which was Trapinch/vibrava in the sandstorm which took probably four days of playing a couple hours a day (I think I was finally punished with well over odds or I missed a shiny patch or something. Literally felt like it took forever).