>>50758050Keyword: Most. Exceptions do exist so long as the bond between trainer and Pokemon exist. It's possible to have a good bond with a Pokemon without being all. In turn, you could be as strong as you want, but without your hearts being in the right place, you'll just end up with Korrina's Lucario, pre-Ash.
Generally speaking: Mega Evolution is an achievement in of itself. Not everyone can do it. Most of the people in the Kalos League conference were Mega Users (Alain, Sawyer, Trevor, that one lady with the Absol), yet you don't see the average folk battling with Mega Salamence or something.
And even then, you're making an assumption that the Nurse Joy isn't strong, or has no battle experience where it's never been stated as such. We don't know how strong she is The Audino is also clearly adept at healing, as is Nurse Joy. She got the Audinite to increase the power of these healing abilities. Not to mention:
>>50758111This. If a Nurse Joy can tame and battle with Latias of all things, then is the sky not the limit?
