Well since there is a topic about Moondancer or Moon Dancer I think we could have a topic about this new 6 ponies group's name too.
Even in the Amending Fences but there was some hints to that Lyra is the part of this six pony grup even if she was back in Ponyville.
1.) We could see her in canterlot in the very firs episode and she even tried to greet Twilight Sparkle who just passed by her.
http://mlp.wikia.com/wiki/Friendship_is_Magic,_part_1/Gallery?file=Lyra_Heartstrings_greets_Twilight_S01E01.png
http://mlp.wikia.com/wiki/Friendship_is_Magic,_part_1/Gallery?file=Lyra_Heartstrings_staring_at_Twilight_S1E1.png
2.) Twinkleshine and Colgate mentions that Twilight that they see her all the time when they are over at their old friend Lyra or sometimes Lyra comes over to Canterlot.
Also they told Twilight that they tought that she moved on so that's why they never asked her to join to them.

Minuette: She did! Twinkleshine literally spit out her oats when she heard you were the Princess of Friendship!
Twinkleshine: We saw you at the coronation. That was some shindig!
Twilight Sparkle: You did?
Twinkleshine: Sure! We see you all the time!
Minuette: You remember our old friend, Lyra, right? [giggles] She lives in Ponyville, too. We're always over there visiting her. Or she's coming over here! [giggles] We've thought about asking you to join us from time to time, but we just sorta figured you'd moved on.

3.) At the end of the episode Spike gives Moondancer a picture from the six of them
All in all I belive the are the Canterlot Six.
http://mlp.wikia.com/wiki/Amending_Fences/Gallery?file=Spike_giving_a_present_to_Moon_Dancer_S5E12.png
http://mlp.wikia.com/wiki/Amending_Fences/Gallery?file=Moon_Dancer_levitating_Spike%2527s_gift_S5E12.png
http://mlp.wikia.com/wiki/Amending_Fences/Gallery?file=Moon_Dancer_tearing_up_at_Spike%2527s_gift_S5E12.png
http://mlp.wikia.com/wiki/Amending_Fences/Gallery?file=Photo_of_Twilight%252C_Moon_Dancer%252C_and_friends_S5E12.png

I went with Canter Six as their moniker. Also I think you meant to say six instead of sex pony group. You might wanna change that otherwise others might get the wrong idea. I am looking forward to what kind stories would these six.

Even in the Amending Fences but there was some hints to that Lyra is the part of this sex pony grup even if she was back in Ponyville

I had to read your post all the way through to be sure this was a typo. Having the Canterlot Six be a "sex pony grup" gives a very wrong impression of what they were probably doing socially. You probably meant "six pony group."

4541223
Woops I guess I haven't noticed that misspell.

Ok fixed it.