Y'know, considering she IS technically the MANE character of the show...

^What he said. Twi's had a crizzap-ton of episodes.

Pinkie has a total of 5 centered around her so far.

Twilight: The Ticket Master focusing on Twilight's decision, Boast Busters focusing on Twilight hiding her capabilities, Lesson Zero focusing on crazy Twilight, Its About Time focusing on Twilight worrying. Total: 4

Pinkie: Feeling Pinkie Keen focusing on Pinkie Sense, Baby Cakes focusing on Pinkie learning responsibility, A Friend in Deed focusing on Pinkie trying to make a new friend, MMMystery of the Friendship Express focusing on Pinkie trying to protect the Cake's cake, Too Many Pinkie Pie's focusing on Pinkie finding to a way to spend time with all her friends. Total: 5

Spike: Owl's Well Ends Well focusing on Spike reaction to Owloysius, Secret of My Excess focusing on Spike's greedy side, Dragon Quest focusing on Spike finding his origins. Total: 3

Rainbow: Sonic Rainboom focusing on Rainbow Dash trying to do the Sonic Rainboom, May the Best Pet Win focusing on Rainbow finding a pet, The Mysterious Mare Do Well focusing on Rainbow trying to unmask the Mysterious Mare Do Well, Read it and Weep it focusing and Rainbow's love for reading. Total: 4

Rarity: Suited for Success focusing on Rarity designing dresses for her friends, A Dog and Pony Show focusing on Rarity being kidnapped by the Diamond Dog, Sweet and Elite focusing on Rarity trying to spend time with her friends and Canterlot upper class, Sisterhooves Social focusing on Rarity's relationship with her sister Sweetie Belle. Total:4

Applejack: Applebuck Season focusing on Applejack trying to harvest all the apples by herself, Over A Barrel focusing on Apple giving her family a tree to plant, The Last Roundup focusing on Applejack not returning to Ponyville, The Super Squeezy 6000 focusing on The Apple family's competition with the Flim Flam Brothers. Total: 4

Fluttershy: The Stare Master focusing on Fluttershy babysitting the CMC, Green Isn't Your Color focusing on Fluttershy's dislike of being a model, Putting Your Hoof Down focusing on Fluttershy learning assertiveness, Hurricane Fluttershy focusing on Fluttershy's past of being bullied for being a weak flyer. Total :4

KatokoAihara:
I'm glad I'm not the only one that's looks at it that way.. I just find it more fun sometimes, when it's just the one character.. I don't mean just for MLP either, I mean any show..

Though in my opinion, Feeling Pinkie Keen seems abit more about Twilight, as she had more air time than Pinkie did, but that's just how I saw it...

She has so many episodes

*Applejack
and ,uh, yeah. She has a lot of episodes about her

After counting, I determined that they've all got approximately 6-8 episodes "centered" around them--so it's pretty evenly balanced so far...but Twilight has the most at 8 (though you could count a few more big ensemble episodes that do focus more heavily on her and say 10-12), and Applejack is second at 7 (whoo! Two of my faves!! And the Apple Family does make for some terrific storytelling!) The rest have 6.

I love that they focus on the cast as a whole and not mostly one or two characters, and include everypony or several ponies in so many episodes...but since it started out with Twilight as the "mane character" and everything blossomed off of her storyline as she met the others, it's not surprising that she's winning this so far. :)

yeah she's the main character so most of the episodes are twilight centric

I also think Twilight does.