It’s worth adding ACNL isn’t yet supported by Pretendo so I’m not sure how you’re going to do that atm. They have confirmed that it is coming soon.
(also, unrelated to your post since it’s for a game specifically, but I am fed up of all these friend code exchanges, can we just have one thread if it’s not for a specific game)
As of April 2025, Animal Crossing New Leaf is now supported for testers only. Learn more about testing at Donation Subscription FAQ and see all games available on Pretendo Network at games.pretendo.zip.
As of May 2025, it’s now public.