>>58241176Damn. There's a lot to unpack here.
No, Megas are not illusions. Their Pokedex entrirs specifically refer to physical, and biological changes, like Glalie's jaw breaking, which effects it's ability to eat.
>It envelops prey in its mouth, freezing them instantly. But its jaw is dislocated, so it’s unable to eat them.You might be thinking of Dynamax or Gigantomax being illusions, like that one sign in Sword and Shield says. But those aren't implied to only be visible to the trainer using them.
Also Ash Greninja isn't either of these.
