Ash's Greninja becomes Ash-Greninja when it enters a special bond with Ash during battle. This transformation occurs when Greninja's special ability, Battle Bond, is activated, usually triggered by a strong emotional connection between Ash and Greninja. Once this bond is formed, Greninja's appearance changes, and it gains a significant power boost, becoming Ash-Greninja. This transformation is a unique and powerful form that Ash and Greninja can achieve together. **

It is uncertain whether Ash's Greninja will come back in the Pokémon anime series. Greninja was a significant and popular character in the series, so there is a possibility that it could make a return in the future. However, as of now, there has been no official announcement or indication of Greninja's return. Fans will have to wait and see if Greninja will make a comeback in future episodes or seasons of the Pokémon anime. **

No, Ash-Greninja was a special form of Greninja that was only available in the Pokémon Sun and Moon demo version. It was obtained by completing a special demo-exclusive mission and transferring it to the full game. As the demo version is no longer available for download, it is not possible to obtain Ash-Greninja through legitimate means. **

Ash-Greninja is a unique form of Greninja, a Water/Dark-type Pokémon, that was introduced in the Pokémon anime series. It is a special bond between Ash Ketchum and his Greninja, where Greninja takes on a more powerful and transformed appearance resembling Ash. This form boosts Greninja's stats and abilities, making it a formidable force in battles. Ash-Greninja's appearance and power are a result of the strong bond and synchronization between Ash and Greninja during their battles together. **

It is uncertain if Ash's Greninja will appear again in the anime. While Greninja played a significant role in the XYZ series, its future appearances are unknown. Fans speculate that Greninja may return in future episodes or seasons, but nothing has been confirmed by the creators or producers of the show. **

No, Ash-Greninja cannot be traded to the Switch. Ash-Greninja is a special form of Greninja that was only available in the Pokémon Sun and Moon games through a special event. This form cannot be transferred to the Switch games like Pokémon Sword and Shield. **

To get Ash-Greninja in Pokémon Ultra Sun, you need to have a copy of Pokémon Sun or Moon where you have completed the special demo version of the game. Once you have completed the demo version, you can transfer your Ash-Greninja to Pokémon Bank. From there, you can transfer it to Pokémon Ultra Sun using Pokémon Bank. Keep in mind that this special Ash-Greninja cannot be bred or traded. **

In Pokémon Omega Ruby, you can obtain a Greninja with the ability Protean by first obtaining a Froakie with the ability Protean in Pokémon X or Y. You can then transfer the Froakie to Pokémon Bank and then to Pokémon Omega Ruby. Once you have the Protean Froakie in Omega Ruby, you can evolve it into Greninja, and it will retain the Protean ability. Alternatively, you can also try to find a Protean Froakie through trading with other players who have Pokémon X or Y. **