Not yet. If I had to hazard a guess, it and Frokie will probably be among the last introduced, since they are usually considered the most powerful/versatile/generally useful.
Reborn Hardcore is a separately developed mod that aims to increase the overall difficulty (especially of the gym leaders).
There are two versions: the 'lite' version that only makes team changes and the the 'CoM' version, which adds several features and makes larger changes.
Lunala (@Honga Did you post in 'Numbersss' in the past two-three hours? I've got notifications, but there isn't another post after mine from a few hours ago)
While a less specific reference, I've heard that the Gossip Garevoir interview where Amaria 6-0's the Reborn League opponent that was testing her continued skill (after amnesia) was based on a similar indecent/test in the IRL league.