Dr. Wondertainment is a mysterious character that had made many SCPs, and is never mentioned as a SCP himself.
This is when he came to Ponyville.
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"Who's that?"
"I don't know."
A strange unicorn stepped into town that day. They said his coat was light yellow, while his mane and tail was blonde. He wore strange clothes, and a top hat. He pulled along a large cart full of strange things.
Twilight wanted to speak with this strange character.
"Hello there. You must be new in Ponyville."
"Oh my, yes. I'm though just a traveler, and I walk these lands, selling strange, yet exciting items."
"Can I have a look?"
"Certainly. How about you look at 1224?"
"Why did you just call it that?"
"Because, dear, some scientist collected one of each of my products, and marked them by number, so I thought a great idea to say their numbers."
"Hmm. Ok then, lets see 1224."
"Aha! My very own Super Science Li'l Chemist Kit! Very interesting to the smart ones."
"It looks very confusing. Are you sure anypony will buy it?"
"They should."
"Well, I suggest you find another town, if that's all right."
"Oh, don't worry. I have no intentions of being here anyways. So long, then."
And the pony left. That was not the end of him, though.