 Greninja will transform into Ash-Greninja if it knocks out a Pokémon during battle, giving it an appearance similar to Ash Ketchum, increased stats, and a stronger Water Shuriken.Unlike Mega Evolution, Primal Reversion, and Ultra Burst, Bond Phenomenon does not require an item to activate.Ultra Burst (ウルトラバースト "Ultra Burst") is a mechanic introduced in "Pokémon Ultra Sun" and "Ultra Moon", exclusive to the Legendary Pokémon Necrozma.