Why does Pinkie Pie have a strong relationship with Rainbow Dash? - Sugarcube Corner - MLP Forums

I always wondered why Pinkie Pie and Rainbow Dash have such a strong friendship?

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The Support of a True, True Friend - Pinkie Pie Awareness - Fimfiction

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Pinkie Pie (O&C), My Little Pony: Friendship Is Magic - Rakoon1's universe Wikia

Why does Pinkie Pie have a strong relationship with Rainbow Dash? - Sugarcube Corner - MLP Forums

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Equestria Uncovered: Taking a Peek at Pinkie Pie – The Reviewers Unite

Pinkie Pie As A Pokemon! (MLP x Pokemon)

Equestria Daily - MLP Stuff!: 50+ Awesome Fanfics to Read for Pinkie Pie Day!

My Little Pony: Friendship Is Magic S3 E3 Too Many Pinkie Pies / Recap - TV Tropes

Action Figure Insider » DISCOVERY FAMILY CHANNEL INTRODUCES THE NEXT MAGICAL CHAPTER IN THE MY LITTLE PONY UNIVERSE WITH BRAND-NEW SERIES MY LITTLE PONY: PONY LIFE #MLP

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Pinkie Pie/History, My Little Universe Wiki