Every pony, every generation, one pose.

[invinible]

I would chose the pose posed on the page over here: http://mylittlewiki.org/wiki/Colombian_Combo_Baby_Pose.

[Watercolors]

The sitting pose

[Cynosure]

Not gonna lie, I'd love to have every pony ever in G3's donkey pose.

[Zenobiaa]

Sitting/Bubbles's pose. It's my favorite pose and I really wish they'd made more ponies in it.

[silverdragon54]

More love for the Posey pose!

[Corona]

Either Shy or Posey pose. Not my favorite poses ever (Bride is my favorite) but I love the ponies in those poses.

[MANIMAL!]

Celestia's pose. After that, the Galaxy pose.

[brightberry]

Posey... then they'd all look like they're going somewhere.

[Sugarberry]

Posey pose is a close second, but I'd love to have them all in Magic Star's rearing pose. 

[silverskimmer]

Oh, the Glow pose or the tiny bubbles pose, so cute!

[reanna-mator]

I love the Posey pose... but just to be a bit different: Crumpet pose. X3 And it's dang cute.

[rybett]

I would chose the pose posed on the page over here: http://mylittlewiki.org/wiki/Colombian_Combo_Baby_Pose.

Like this idea! 
Or Sitting.  Just one pose?  HARD!!

[Sabrina]

I really like shy pose. They look like they need hugs.

[Primrose]

I can't decide! Either Dancing Butterflies pose, shy pose, or sitting pose 

[ValeofSpring]

I'll probably be a minority of one, but I'd say Cotton Candy's pose (concave NOT flat foot).  It's classic MLP and super cute!