In the time I've been playing, I have made several lucky friends. However, in the past few months, I have since made new Best Friends, and continued interacting (trading, battling, sending gifts, etc) in order to trigger and re-trigger Lucky Friends with all of them. However, it simply hasn't happened.
I have noticed a couple of odd things - mainly the animations. I cannot "skip" through the items I receive through gifts, and the "friendship level increase" animation doesn't happen either (it doesn't "pulse"). The level does still increase with other friends (I have only been able to notice this by observing over a long period of time).
So has "Lucky Friends" been disabled, or is it bugged on some way, or am i just very unlucky?