Battle Bonds

As special as the bond between Ash and Greninja is, there are many more trainers out there in the world, each with their own Pokémon that they share a special bond with, some due to certain circumstances, and others due to time. Surely, a handful of these trainers could do the same thing Ash did with his Greninja, right? Note: Same as my story in Wattpad, but focused more on Sendara