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Bond Phenomenon
From Bulbapedia, the community-driven Pokémon encyclopedia.
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(Japanese: キズナ現象 Bond Phenomenon) is an anime-exclusive transformation similar to Mega Evolution. It is said to have some connection to the Pokémon's hidden potential. All known Pokémon obtained this transformation are Greninja.
Unlike Mega Evolution or Primal Reversion, the transformation doesn't require any specific items for either the Trainer or the Pokémon. Instead, Bond Phenomenon maybe achieved when the trust between the Trainer and the Pokémon reachs maximum, but not all Pokémon can obtain it.