PinkieDash

PinkieDash is the femslash ship between Pinkie Pie and Rainbow Dash from the My Little Pony fandom.

Season 1
In this episode Griffon the Bush off, Pinkie Pie and Rainbow Dash bond by playing pranks on the other ponies, but when Rainbow Dash's old friend, Gilda the griffon, shows up for a visit, Pinkie gets left out.

Start with the episode, with Pinkie Pie and Twilight Sparkle spending time in a park, with Pinkie enthusiastically relating some story about Rainbow Dash's aerial acrobatics to Twilight, who is reading a book and not paying Pinkie much attention. Pinkie spots Rainbow flying up above and calls to her, but Rainbow Dash tells her "not now". Pinkie pursues Rainbow Dash and calls out to her, until Rainbow Dash slams into a mountainside and slides down next to Pinkie, who tells her she was going to warn her about it. Pinkie reveals that she was trying to find her so she could help in playing a prank on Spike. Using a nearby thundercloud, they wait for the baby dragon to exit the town square pavilion. Once Spike is out, upon a signal from Pinkie, Dash kicks the cloud to ignite a thunderous boom, scaring him.The scare causes him to hiccup repeatedly.After making sure Spike is okay, the two commence (Rainbow Dash and Pinkie Pie) a pranking spree on the rest of their friends. They use water colors on the apples in some of Applejack's apple trees, switch Twilight's pen ink with disappearing ink, and use sneezing powder on Rarity. At a nearby lake, when Pinkie learns that Rainbow Dash sees Fluttershy as their target for a fake squirting turtle toy, Pinkie Pie immediately stops her. She warns Rainbow Dash that Fluttershy is too sensitive for even the most harmless of pranks. The two end the day by pranking each other instead by Hoofbumb.

Fanon
Rainbow Dash first Friend in Ponyville is Pinkie Pie, And they becoming Best Friend.