If I'm correct, Flick won't buy bugs from anyone that's visiting the island he's on. He only buys from residents of the island, i think

Yes, you are correct. =P

FYI you can simply catalogue someone else's Royal Crown, since I too have heard you can't sell your bugs and fish to Flick or CJ when visiting someone else.

Royal Crown and Crown can be catalogue ordered now.

I'd rather not do that, just a personal "how I wanna do things."

I did confirm that Flick won't buy insects if you are a visitor, so yeah. =P

By the way, the thing about roses.
It turns out, it is possible to breed blue roses from orange roses, there's more than one way to breed blues.
But it's all a complex system of rose lineage.
https://aeonsake.gitlab.io/acnh-flower-breeder/
Different lineages can make certain offspring between two parents more likely.
The main point though is that any roses with some red, yellow, and white ancestry, has a chance of breeding blue roses from another of such ancestry. There's a specific gene for orange roses that is very likely to produce blues, 25% rather than merely 1.5%.

Seems like it still may be easier for me to just keep trying to breed orange and yellows to get "special" reds to hope for blues.
Maybe I can invite some friends to water the few reds I've got.

It isn't that you get "special reds", it's that you get roses that have particular genes inherited from parents.
Blue roses can be bred from red, white, yellow, orange or pink roses. It doesn't seem like purple roses can produce blue roses, though.

Actually, it turns out that apparently orange roses found on rare islands will always have the gene type "2-2-1-1", which when bred with each other will have a 6.25% of producing blue roses with the gene type "2-2-0-0".
However, if the orange roses produce more orange roses, these can have the gene types "2-2-0-0", "2-2-0-1", "2-2-1-0", or "2-2-1-1".
Anything that is not "2-2-1-1" is incapable of producing blue roses.

Once you successfully produce a pair of "2-2-2-0" gene blue roses though, breeding these with each other is guaranteed to produce blues and only blues. They can also produce blues if bred with a "2-2-1-0" type orange rose, but it's 50/50.

I see, well I'm just gonna keep trying what I am doing. =P

Weird, since i had friends coming to my island to sell bugs to him before and it worked just fine. Did they change it for some stupid reason?

Maybe, I dunno. I even visited a person who is a Nintendo Friend with me so that was a best case scenario and it didn't work.

Why don't you give the bugs to the person, have them sell them and give you the bells

I don't think you give bugs to people, but that's just too tedious to deal with.
I mean I did get enough money for the crown. =P

Bruh, I can just loan you 500k.

I was visited by his otter buddy today. Not sure what the deal is....