Hey, Pokemon Fans, Bronies, and Cooper Gang Recruits! Have you wondered how Raptor evolved from a Gabite to a Garchomp? Or how Rarity got better at persuasion? Or how Sweetie Belle got better at forming plans? Or how Water Wing gained the ability to use his wings and fly? Well, let's go back in time, to one year before the first MLP FIM episode. Time for a hidden story of Multiverse Hearts, Adventures of the Past!
Disclaimer: I don't own MLP: FIM, Pokemon or Sly Cooper. I was only inspired by them to make stories.

Characters:

• Rarity/Diamond Cooper: A fashionista unicorn who is fantastic at making and sewing dresses and costumes
• Sweetie Belle/C-Note Do Cooper: A unicorn filly who is Rarity's little sister
• Water Wing/Shark Hawk Cooper: A pegasus colt who is a close friend and brother of Sweetie Belle
• Sapphira Cooper/The Azure Raccoon: Rarity, Sweetie Belle, and Water Wing's aunt, the strange master thief of Equestria from another world who steals from other criminals, and wife of Chivalry Bouffant, who is the younger brother of Betty Bouffant
• Rioichi Cooper: One of Sapphira's ancestor, who is a master ninja in Japan who can stand on the tip of spires
• Tennesse Kid Cooper: Another one of Sapphira's ancestor, who is a gunslinger, railrunner, railrider and the greatest outlaw of the old west
• Slytunkhamen Cooper: Another one of Sapphira's ancestor, who is a thief that can turn himself invisible
• Otto van Cooper: Another one of Sapphira's ancestor, who may lack physical prowess, but makes up for it with his engineering and pilot skills
• Rainbow Dash: A blue rainbow-colored-maned pegasus who is the foster twin sister of Raptor
• Raptor: A Blue Gabite that can turn black, who is Rainbow Dash's sister
• Applejack: A strong and truthful earth pony who is a member of the Apple family at Sweet Apple Acres
• Fluttershy: A timid and caring pegasus who lives in her cottage with her animal friends
• Pinkie Pie: A energetic and joyful earth pony who is a super-duper party planner of Ponyville
• Princess Celestia: Ruler of Equestria and raiser of the sun

The Heartless Five (Heartless Copies of the Fiendish Five):

• Raleigh Soulless: Chief Machinist of the Heartless Five
• Muggshot Soulless: Brawns of the Heartless Five
• Mz. Ruby Soulless: Mystic of the Heartless Five
• Panda King Soulless: Demolition Expert of Heartless Five
• Clockwerk Model HS/Steelslash: Leader of the Heartless Five, and Eternal Enemy of the Cooper Clan