Jömungandr took a deep breath as he channeled his energy towards Meredith. While he didn't have a Key Stone, he used the Infinity Energy inside him to link himself to her. Soon, she was enveloped in a light...
Heidi could feel the energy, too; however, unlike Jörmungandr, the energy coming from Meredith was... softer and more disarming. She wasn't sure what this was, but the sense of peace could be felt even more from this surge.
Eventually, the light dissipated, revealing what had finally happened.
"Hello, Heidi." Meredith waved. Unlike Jörmungandr, she looked different. "I'm sorry if we've been keeping this as a surprise to you."
"..." Heidi understood now. She heard about Meredith's Mega Evolution -- how she could enhance the capabilities of others while being one of the tankiest creatures to walk the land. However, it was always known that the two would never Mega Evolve together in one battle. She wondered why that was.
...speaking of wonder... something else was the matter. The moment the Mega Evolution was complete, she felt a sort of energy cut itself off from her. Strangely, it was like she wasn't providing anything to Meredith in the first place. What was that about?
"So, you two have been planning to Mega Evolve each other from the start, huh?"
"That's right." Meredith nodded. "Ever since you built this body for me and allowed me to reunite with your father, I've been planning for this very moment." She gave Jörmungandr a hug from the side. "Your father had told me of the many feats that you've done during the war, and detailed your other achievements since you've come from this world -- our new home. You've grown so much and gained so much valor since the day I left you on Southern Island all of those years ago. I had so much faith in you that you'd grow into a strong and loving dragon -- yet you eventually found a way to surpass even my wildest expectations. I could not be more proud to be your mother...."
"...? That's nice and I'm happy that you're proud of me but--" Heidi crossed her arms. "What does that have to do with... well... all of that?" Heidi gestured to Meredith's... well... everything.
"Is it not obvious, little one?" Meredith giggled. "You've achieved so much and reached such great heights. It was an inevitability that we'd test you ourselves."
"... but like, you weren't someone that liked battling, though. I still remember when you taught me so much about finding peace and tranquility instead of seeking violence when I was a little girl. Even in war, you were more of a healer and helper than a fighter."
"...and yet I was also the one to train many of our soldiers to a base level, as well as one of the leaders of the Kalos War."
"Wh--huh!? You were a what?"
"Oh, my sweet, lovely daughter. It seems that there is more to me than you knew." Meredith giggled. "Yes. I was one of the army leaders of the Kalos War 3,000 years ago. It was actually how I got to know your father so well in the first place. Much of my help was with morale, healing and boosting, sure, but I could hold my own in a fight should the need to regroup arise."
"Huh. Well then. The more you know."
"Your mother and I have trained to be in tune with each other's Mega Evolutions for some time." Jörmungandr nodded. "Unfortunately, the only individual to ever see that progress was our Arceus, as we were forbidden from working together while both of us are Mega Evolved during the war."
"Huh? That's... strangely specific. I heard that no one has ever seen the two of you Mega Evolve at the same time, but I just attributed it to the rumors around you, dad.... You know, powerful enough to make armies surrender and stuff like that?"
Jörmungandr and Meredith looked at each other.
"George.... I told you that your reputation was going to be first on anyone's mind, didn't I?"
Jörmungandr shrugged. "Better forced the intrigue on me than give you more worry, my love."
"Yes, but even with our daughter? Do you know how quickly her feelings about us could change after this?"
"Better you than me. I was never good with words."
"Then, just cut to the chase so we can fight alreadyyyyy--"
"Heh. She sounds just like you, George: so impatient to hear the reason and ready to get to the action." Meredith giggled. Despite her tone, she was enjoying this.
Heidi was slightly offended. "Wow! Rude, mom! I just wanna know what's going on. Why were you guys banned from fighting together as Mega Evolutions?"
Meredith turned back to her child. "...It's because, both times we did so, our combined power was so destructive that it would destroy everything in the Hoenn Region... including the very trainers that Mega Evolved us." She shook her head. "The first time on the battlefield, even with the combined might of Groudon and Kyogre, they were forced to retreat after we decimated them without any effort. The second? Well, it was against Friede herself in her own Origin space. We fought her off valiantly, nearly winning in the end, but the power we were to unleashed would have costed our human companions' lives. As such, we were forced to hold back." Meredith turned to Jörmungandr. "... but now that we don't have humans to watch out for...."
"...You want to unleash everything on me, the new Arceus, without holding anything back." Heidi's heart started to sink. Did they really fight Friede way back then and nearly win? Could they really have destroyed an entire region by themselves? From the sounds of it, did she even want to risk staying in this form? "This isn't just a lesson and a progress check for me.... This is to finish what you started with Friede, isn't it?"
"... One can say that, yes." Jörmungandr took a step forward as Meredith took a step back. "What's a Pokémon without wishing to learn their own full potential these days, hm?"
"...You got a point there." Heidi stretched a little. "Well, if you're really that strong--"
Heidi switched to High Power!
"Then perhaps we shouldn't hold back our own power, either."
"I wouldn't want to have it any other way, Heidi." Now, it was time to show off what they got.
