http://www.pokemonxy.com/en-us/whats_new/mega_evolution/> Secrets of Mega EvolutionThe truth behind why some Pokémon can Mega Evolve is becoming more clear. When you look closely at the main character's left arm, you'll notice a bracelet called the Mega Ring. When a Pokémon is holding its Mega Stone, the Mega Ring and Mega Stone resonate, triggering Mega Evolution. It is said that the strong bond between a Pokémon and its Trainer also plays an important role in making these two items resonate.
FOOLS! NOTHING BUT FOOLS! For Mega Forms to even work over Wi-fi, the Amie will have to as well.