[Matrixbeast]

So, one of my friends said that, because it's impossible to escape the show, he'd be willing to give it a chance. Once I told him it's currently as 65 episodes, a movie, and a 26 episode long 4th season coming up, he then said that he wanted me to get back to him with the "Important" episodes to watch, so I think I just figured it out.

It's from 28-37 episodes long, because some episodes I was unsure whether or not they were significant (They're marked with a question mark). Am I missing any "Important" episodes? I put mini descriptions for what made the episodes important, but I won't include the descriptions when I give him the list.
Also, I decided that the Gala mini-arc was too self contained and had no bearing on the series beyond those 3 episodes.
1) Friendship is Magic: Part 1 (Mare in the Moon) - Introduces Setting and main characters.
2) Friendship is Magic: Part 2 (Elements of Harmony) - Introduces Elements of Harmony, Luna, various character traits and abilities.
3) Boast Busters - Introduces the level of magic Twilight can perform.
4?) Dragonshy - Is the Stare important?
4) Bridle Gossip - Introduces Zecora.
5?) Swarm of the Century - Introduces Twilight's panicked nature when it comes to Celestia
5) Winter Wrap Up - Explains that weather is completely managed by the ponies.
6) Call of the Cutie - Introduces the Cutie Mark Crusaders
7) Suited for Success - Introduces Rarity's singing voice~ <3
8) Feeling Pinkie Keen - Introduces Pinkie's Pinkie sense, Gummy
9) Sonic Rainboom - Introduces well...The Sonic Rainboom
10?) Stare Master - Seriously. Is the Stare important?
10?) The Show Stoppers - Introduces the possible talents of the CMC
10) A Bird in the Hoof - Introduces how awesome and chill Celestia is
11) The Cutie Mark Chronicles - Gives backstory on all the characters, explains how AJ knew Rainbow Dash performed the Rainboom as a filly back in "Sonic Rainboom"
12) Owl's Well That Ends Well - Introduces Owlowiscious

13) Return of Harmony (Both parts) - Introduces Discord
14) Lesson Zero - Twilight's neurosis concerning Celestia is reestablished, introduces the remainder of the cast writing leters to Celestia
15) Luna Eclipsed - Introduces Luna's new design
16) May the Best Pet Win! - Introduces Tank
17?) Sweet and Elite - Introduces Twilight's sweet dance moves, Pinkie's Party cannon
17) Secret of My Excess - Establishes how dragons age and grow
18?) Hearth's Warming Eve - Establishes that neither Discord nor Celestia and Luna founded Equestria
18) Family Appreciation Day - Establishes that the Apple family founded Ponyville
19) Baby Cakes - Introduces Pound and Pumpkin Cake
20) Read It and Weep - Confirms that Rainbow Dash knows how to read.
21) A Canterlot Wedding Part 1&2 - Introduces Shining Armor, Cadance, Chrysalis, and the Changelings

23) The Crystal Empire Part 1&2 - Introduces Sombra, the Crystal Empire, and the existance of Dark magic
24) One Bad Apple - Introduces Babs Seed
25) Magic Duel - Establishes that, despite Twilight's skill at magic, she still has limits
26?) Sleepless In Ponyville - Establishes a new power for Luna, who is now able to see inside dreams
26?) Apple Family Reunion - Confirms that AJ's parents are deceased
26) Keep Calm and Flutter On - Reintroduces Discord and makes him good/less evil
27?) Just for Sidekicks - Runs concurrently with Games Ponies Play
27) Games Ponies Play - Introduces Dash's potential father, confirms that Shining Armor isn't running back and forth between Canterlot and the Crystal Empire
28) Magical Mystery Cure - Introduces Princess Twilight Sparkle

So...Did I miss anything?