>>54349000Only costs 800 if both accounts have the legendary registered and are best friends.
Though you can only do this once a day unless there's some event or season bonus that allows for additional special trades.
Myself I only transfer legendaries that got a bad roll from a trade, and only to Home instead of outright deleting them.
If you've got a special trade to use up, and happen to have some old legendaries just sitting in storage, offering your aged legendary for someone's unwanted legendary or community day shiny is a good strategy.
If the two Pokémon being traded have celebrated a combined three birthdays, this maxes out the lucky odds to 20% (+5% per birthday), so 1/5 chance you get something nice out of it.
I did that today, my trade partner got a 100% Kyogre, they were thrilled.
