Omega Ruby was once just an ordinary girl in an ordinary world... she lived in the village of Kalenth, a place where the great legendary Pokemon Groudon was worshiped. All wore rubies there and prepared for the Grand Ceremony of the Red Quartz, one which was said to bless the ground upon their feet walked.
Then one day, the enemy village, Teranth, attacked. These blasted Kyogre-worshipers flooded the Sacred Grounds and ended up killing nearly half of the village. Omega Ruby watched before her eyes as her beloved sister, all she had left in the world, was drowned in the awful dank sea. "Kyogre is the demon of the sea. Never forget that, Omega," The words of her deceased parents rang true now more than ever and she could stand for this no longer.
Omega Ruby took the ruby she had been given at birth and pressed it down into the ground. She prayed to the great god of our beautiful mother earth to give her the power. "Give me the power of Omega, my namesake!" proclaimed Omega Ruby. The legends heard her plea and her body was flooded with immense energy. She could feel the energy of the earth radiating through her soul, the pure power of her ruby that she had never known.
Her body transformed into the great beast Groudon as the Teranth villagers screamed in horror. But now they would pay. Now they would...
Immediately, she rose the earth and created great cracks in it, in which all of the flood water dripped into, completely harmless. But Omega Ruby found herself consumed with power. This body was too great for that of a mere human. She couldn't stop her rampage, taking mighty steps and creating earthquakes all over Kalenth. The village and all those who fought were soon decimated.
Her body soon reverted back to its original form and the damage could not be undone. Omega Ruby wept for her people and cursed the power of the legends. She had gotten her revenge, but at what cost?
Soon, the greatest legend of all, Arceus, appeared before her.
"Do not weep, Omega. You have been chosen for a greater purpose and you must learn to harness your powers. Be proud of your namesake, be proud to have the power of the great Groudon. Though many lives have been lost, they will live on... in here," The great God Pokemon pointed at Omega's ruby and she felt the power of all those she loved pulsating through it. For a moment, she could've sworn she saw her beloved sister flash a smile.
"I... I will make them proud. I will proudly bear the namesake of Omega Ruby!" She proclaimed with renewed determination and she went on her way to wander the earth. Where her journeys would take her, nobody would know.