One of Shelly's more popular nicknames on the PO server was Fluttershelly so that's not too far-fetched...
Yeah, Laura was confirmed as one so that's a given, and I have my suspicions that Bennett might end up being one as well, once his training is finished. Also, it may be spoilers, but-
Lin was the champion of the season one league on the server (and she was no less scary than she is in the game, going as far as disallowing spectators in every match and holding said matches in a different channel) so that sounds likely.
Level 100 by the end of the game at this rate is definite, so I'd say to expect competitive level teams (they're already getting pretty strong as it is now) for sure.
Also I know I may be like you know co-owner but even we have our moments of non-professionalism, so please excuse the following.
I like you El is bad he's a jerk and I hate him and he's so ughghhghghghhgghghghhghhhhhh
he is my single-most hated leader from the season one league because i had to battle him like 10 times total and his team is a trap he had blissey and porygon2 and snorlax and if you tried to set up to kill them he would send in ditto and you'd be screwed and if you didn't set up you had to have really good base power which is something i didn't have and AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA i hate him so much don't trust him ever >:C