Could transferring a legendary affect catch rate?

It's not a coincidence. It's real. It knows you've disrespected it and now it's deliberately changed the entire catch algorithm accordingly.

Or, you're just not catching them, It's RNG after all.

I have transferred quite a bit of legendaries. I still keep catching them just fine.

Transferred more than I kept. I keep catching.

I would think it s juz coincidence and could share my statistics with you. Basically I ll transfer legendary pokemon IV below 86.7 so actually I have transferred more than half of which I have caught. But the catch rate is more or less the same for the 3 team birds.

I reinstalled the app and now I can catch them again... might be coincidence.

Since i have been wearing a scottish kilt and a sombrero with a peacock feather, i have cought every single legendary raidboss. I do not believe in coincidence.

It's just your brain trying to find patterns from nothing.

But think about it this way - why would Niantic specifically put effort into altering catch rate based on whether someone has transferred a Pokemon or restarted their game recently or some other arbitrary requirement.

I'm sure a conversation like this never popped up during the game's development: "You know what would be a good idea? Boosting catch rate if someone uninstalls and reinstalls their app, and lowering catch rate if someone transfers low IV Pokemon"

It's almost definitely a coincidence. But I've long thought something like the opposite should have been introduced. I.E. The catch rate for each legendary should be higher (perhaps on par with normal Ultra Ball usage) if you have yet to catch it, and be extremely lowered (current levels) if you have already obtained it. Perhaps I'm thinking too generously, but my personal experience trying to catch Articuno, the final of the four birds I caught, required more successful raid attempts than it took to obtain Moltres, Zapdos, and Lugia combined.