Rarity and Spike each struggle with who they are, and who they want to be.
Season 2, Episode 9: "Sweet and Elite"
The brushoff from the high-class ponies inspires her to make the design for Twilight's birthday dress something extra-awesome, and worthy of Canterlot.On her way from getting the fabric for Twilight's dress, she bumps into another high-class unicorn, one she already recognizes: Fancy Pants, the most important pony in Canterlot, just cuz. (His skinny mare companion goes unnamed, but she's no doubt a relation of Princess Cadence, who we'll get to in the finale.) When Rarity mentions offhand that she's staying in the castle, Fancy Pants deduces that Rarity is important, and invites her to join them at the Wonderbolts Derby later that day. The conundrum: Hanging with the Fancy Pants crowd can do wonders for her status in Canterlot... ...but it will also cut into the dress-making time for Twilight. Rarity decides to err on the side of social climbing and go to the Derby. Opal disapproves of this choice, and when Opal is the moral center, you know Rarity's gone off the rails. Rarity's ascent into Canterlot high society leads into this episode's song, "The Kind of Pony Everypony Should Know." Unlike other aspirational songs (like "Winter Wrap Up" or "At the Gala"), it's the first time a song has been placed in the context of a pony doing the wrong thing -- and knowing she's doing the wrong thing ... specifically, not even coming close to finishing Twilight's dress.
It's a fun song otherwise, and turtleneck / beret / bangs is a darned good look for Rarity. (It also includes a Derpywatch, and, hi, Photo Finish!)As she's about to return to Ponyville, she receives an invitation from Fancy Pants to the Canterlot Garden Party -- which, for us continuity nerds, is established as the second biggest event after the Grand Galloping Gala. If she doesn't go, she'll lose all her juice! So she lies to Twilight, claiming that Opal is sick and can't make the trip back to Ponyville. Dragging Opal into this is not okay, Rarity. And she would have gotten away with it, except that the rest of the Mane Six Minus Spike show up unexpectedly at her suite. Seems Pinkie Pie and Twilight relocated Twilight's party to Canterlot so Rarity doesn't have to miss it ... and, much to Rarity's relief, Twilight loves the 95% unfinished dress, what with it being so simple and practical, which is much more appropriate for Twilight than the fancy dress would've been. Rarity's relief is short-lived, since Princess Celestia's offered them the Canterlot Castle Ballroom for the birthday party. Normally that would be fine, especially since Pinkie Pie brought her Party Cannon (you Maker's Faire people need to build one of these right now) ... ... but the Canterlot Garden Party is happening right outside, and the Rules of Farce require Rarity to try to attend both.
The (diegetic!) music playing at Twilight's party is another example of the show's musicians deftly recreating an old-timey style -- in this case, it reminds me of one of my favorite Link Wray songs, the aggressively lo-fi "Friday Night Dance Party."
As a Fresno native who's lived in San Francisco for the last eighteen years, I couldn't agree more.