You cannot obtain Ash-Greninja in any Pokemon game older than Sun and Moon. As, for getting Ash-Greninja in Sun and Moon, you have to complete the demo of Sun and Moon. After you complete the demo, you can transfer Ash-Greninja to the full game.
The only way to obtain a Greninja with Battle Bond is by playing the Sun and Moon demo, which can be downloaded for free in the EShop. You cannot get this Greninja in XY or ORAS.
Source: knowledge and experience