Why can't I get a shiny?

Question

I got the Shiny Charm, decided to do some shiny hunting, gave up on the Masuda Method, and headed off to Resolution Cave to catch a green Golbat.
I decided to stop at the fishing stop first, because that was where I caught my Dratini. I figured I might as well try to catch a shiny Dratini while I was there. I got Magikarp instead, so I just chained it until I got a shiny.
I was feeling good about myself, and decided to make things interesting for myself by shiny hunting everything I could. I headed to Route 2 to catch a Growlithe, but got sidetracked by a Rattata. I want a shiny. I'm doing what I did for magikarp, and I don't know what's going wrong!
Let's start with my Pokemon:
My ace is Scizor. It knows False Sswipe (Because I'm feeling merciful to those stupid Rattatas), as well as Flash Cannon, X-Scissor, and Brick Break to KO non-shinies. They're all lower than level 12, so I don't really care about damage.

I have counted all the successful calls up to the 70th.

I am far past 70 Rattatas summoned, but no shiny. What am I doing wrong? I keep switching so they don't Struggle, and I should be at peak efficiency. It's taking way longer than Magikarp.

Comments

"A chain length of 70 to 255 gives you a 1/1024 chance of encountering a shiny (normally 1/4096). If you have obtained the Shiny Charm, the chance becomes 1/683." 1/683 is approximately 0.15%, which is still pretty dang low. Just because you got one shiny quickly but can't get another shiny more quickly doesn't mean that you're doing anything incorrectly.

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You sir, are honorary best comment.

Answer 1

You got lucky with the Magikarp, I guess. You're not doing anything wrong, just not the best luck. 0.15% is a pretty low chance, and players can spend a lot of time trying for a shiny.

Comments

Fine, I guess. but Magikarp was relatively quick, but rattata took me most of yesterday, and still going.

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I am so close to giving up on this stupid red rodent right now.