This story is a sequel to Ben 10 Ultimate Pony!
After being surrounded by Vilgax on the Null Void, Ben sends his friend Rex to Equestria to get some help from his honorary aunt and her friends. With the power of Friendship, the Bearers of Harmony would help Ben to defeat Vilgax once and for all.
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I can see Pinkie turned into Confusion for the Chocolate Milk Rain or Mr. Smoothies Rain
I kind of want to see Pinkie turn into Rath
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I feel sorry for Vilgax. Next chapter please