I’ve been having issues catching an Onyx at the starter cave. I’ve put it to sleep and near 1hp. Dumped nearly 8 balls on it and still no luck. I checked a catch rate calculator and it said that it’d only take me ~3 balls to catch it under those circumstances. Was this intentional for a harder difficulty or is it a bug?
I believe you’re just having amazingly bad luck, 
looks like I need some ultra balls just to make sure…
sadly, i can throw 10+ pokeballs on any pokemon in orange and red and still not catch it, including great balls and even axew got out of an ultra ball at red. like this games catch rates i hate to say are ridiculous on anything. at least for me, there needs to be a config option in files to be able to adjust it. i just dont want to have to spend 1k+ per pokemon even on the common ones.