Shiny fletchling is my least favorite shiny of all time

I don't like shiny fletchling at all, it's so annoying to catch, I found so many when I wanted different shinies (swirlix/spritzeez spawn in the same areas I found the fletchlings.) And also one ran away then sparkled after it ran away, why did it sparkle if it was already gone? And the other ones I found were so hard to catch I found them all on roofs but they were below me so I had to fly down, crouch carefully with no Pokemon out, save where it can't see you, perfectly snipe the fletchling from far away, if it miss it will one away and you have to exit and re-enter, it is not even a good shiny, and has no mega. it's just annoying that I get so many duplicates, multiple shiny fletchings, pidgeys, and skidoos when there are other pokemon near them I would of preferred.