Bond Phenomenon

Similar to Mega Evolution, the Bond Phenomenon, also known as the Battle Bond, is another temporary transformation, believed to be caused after a Pokémon harnesses its hidden potential.
However, unlike mega-evolving, no stone is required to cause the transformation.
We believe it is a result of the trust between the trainer and the Pokémon reaching its highest point.

Trainer Ash Ketchum and his Greninja syncing

Currently, Greninja is the only Pokémon to have
been observed going through the Bond Phenomenon.
As of now, we are working our hardest to try and change that.

Ninja Village monument dedicated to their hero, Greninja

As of recently, another Greninja with this astounding ability has been seen- owned by
near-league-champion, Ash Ketchum, his Greninja has been
seen to take on a new, more powerful form.

Trainer Ash Ketchum and his Greninja (dubbed "Ash-Greninja") having experienced the Bond Phenomenon
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