Compared with Mega Evolution alongside Xin Mu, achieving Mega Evolution with Meownei was actually a little harder.
After all, so far, there had been no examples of a Pokémon acting as a Trainer and helping another Pokémon Mega Evolve.
Overall, Mega Evolution depended partly on strength. If a Pokémon could not handle that power, the Mega Evolution would naturally fail.
Lucario had already met that requirement.
The other factor was the relationship between the two parties. Mega Evolution required resonance between a Mega Stone and a Key Stone, after all, and that was not something just anyone could achieve.
As for Meownei and Lucario's relationship, that went without saying. Meownei and Xin Mu had raised Lucario, so resonance was no problem either.
The biggest issue was their lack of experience. They would have to figure everything out from scratch.
Only after Xin Mu and Lucario could Mega Evolve proficiently did Meownei begin working on her side of things.
That ensured Lucario could control the power, preventing any major mishaps during their attempts.
Trying it at the Therapeutic Hot Spring would also help prevent any damage from rampaging energy.
"Meow. (By the way, how do you use this Key Stone?)"
Looking at the Key Stone set into the bracelet, Meownei could not quite work it out. This was completely outside her knowledge. Mega Evolution had nothing to do with Meowscarada in the first place, much less acting as a Trainer.
"Uh... give me a moment to think about how to explain it."
Meownei's question stumped Xin Mu as well. There was essentially no special method for using a Key Stone. It was more like... once you put it on, you knew how to use it.
"Squirtle... (Something's wrong with this household. Isn't there a bit too much to learn...?)"
Squirtle was