Miracle Fruit, Mysterious Fruit and Goddess Fruit / Fruit of the Goddess
Miracle Fruit, 
Mysterious Fruit & 
Goddess Fruit / Fruit of the Goddess are items that reconfigure the size of your Digimon, for better or for worse.
Availability
You can get Miracle, Mysterious Fruits & Goddess Fruits / Fruit of the Goddess in numerous ways:
From the Cash Shop for 29 Crown each (Goddess)
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Kamemon (Digicore Merchant) for 30 Digicores each (Miracle)
From 
Holy Artifacts (Miracle)
From 
Crack of Devimon Box (2x) (Miracle)
From 
Super Crack of Devimon Box (2x) (Miracle)
From 
Mega Box (2x) (Miracle)
From 
Giga Box (2x) (Miracle)
From 
Chimairamon's Data for Normal (3x) (Miracle)
From 
Chimairamon's Data for Hero (5x) (Miracle) & (Goddess) (2x)
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Datamon Treasure Box [Normal] (Mysterious) -Tradeable
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Datamon Treasure Box [Hero] (Goddess) -Tradeable
From 
Desert Blessing (Miracle) & (Goddess)
Drop from any digimon in Server Continent Canyon and Server Continent Pyramid (Mysterious)
From 
Water Crystal Chest (MegaSeadramon) / (Marin Devimon) / (Xuanwumon) (5x / 10x / 20x) (Miracle)
From Water Crystal Chest (MegaSeadramon) / (Marin Devimon) / (Xuanwumon) (5x / 7x / 10x) (Goddess)