@Daneasaur  
Bulk Knuckles, daughter of an earth pony mare and Bulk Biceps. (Crazy headcanon I know.)

That’s Earth Pony strenght, yo!

Power Pink

@Ponymous  
I second this.

She was seen interacting with Button Mash near the beginning of the episode.

Herculina!!

I dunno why…. but I wanna call her Tina.

I wand to say it’s something to do with Pipi Longstockings, but apart from the haircut, there isn’t much of a connection…

@PoolofCarp  
Maybe there is a hole, we can´t see from our perspective or just….magic

We found tigress’s pony.

We’d better, or she’ll break our legs.

@PonyPon  

 
Watch, it’s an echidna and she’s a joke pertaining to knuckles.

. . . we need to make her popular.

She’s going to grow up to be another Maud.

With a…hedgehog cutie mark?

How did the ball get under the house in the first place?