There's an odd thing going on at this point. Hasbro did another redesign of the ponies and stripped the toy line down to seven characters; Pinkie Pie, Rainbow Dash, Cheerilee, Scootaloo, Starsong, Toola-Roola, and Sweetie Bell. This is called by the toy collectors 'Core 7', but for some reason while the animations were also cut down to the core 7, the animation art style didn't change to match the toys until one year later. There was likely some communication issues between Hasbro and SD entertainment.

Because of that, there's some confusion as when exactly 'Generation 3.5' started. This still appears to be the same setting as the rest of G3, but Hasbro goes very experimental with authorizing content from other animation studios, doing webcasts and the like, so it gets even trickier to figure out what's going on. I'm going to call this G3/C7 until the animation style changes, but I might change my mind depending on what these episodes are like.

Pinkie Pie's Special Day (G3/C7 Direct-to-DVD Short packaged in the playset of that name, 2008, 12 minutes)

Summary: It's a day to celebrate Pinkie Pie!

Hey Scootaloo.

Ponyville seems the same, but the characters have changed slightly. Rainbow Dash isn't all 'darling'.

Hey Sweetie Belle.

Wait, is that Cheerilee? She's lost her horn then, and changed color and cutie-mark. With Starsong, that's one unicorn, one pegasus, and five earth ponies.

The Rainbow of Light is making a re-appearance. Interesting.

This is going to be a clip show, isn't it?

They're showing other characters in the flashbacks, but they're not involved in the main ... story. It's basically reinforcing that this is still G3 though.

No, that was the *tradition*, not Pinkie's idea.

Reinforcing the pinkie-party-pony introduced previously.