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Greninja is also the first of Ash's first regional catches that is not a Normal/Flying-type since Heracross, as well as the only one that is incapable of flying.With Froakie, this is the first time that Ash catches a starter Pokémon as his first Pokémon in a region.When he reunited with his trainer, he happily agreed to rejoin him as Squishy went to Bonnie separating from Z2 as it wanted to join Ash on his journey as it did not want to join Bonnie.Ī † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves. In the Prologue, it is revealed that Greninja and the two Zygarde Core Cells finished off the rest of the root of negative energy by the time Ash came to Kalos. He was left at Kalos to protect the region from the negative energy left from the Team Flare Incident. Greninja was a Pokémon Ash caught in the Kalos Region and was one of his main Pokémon during his Kalos journey. A lack of these traits in his previous Trainers may be what caused Greninja to leave them. He also showed genuine concern for Ash's safety when Ash jumped off the Prism Tower. Greninja was impressed and surprised by Ash's willingness to put himself in danger to help a Garchomp that wasn't his Pokémon and barely knew, and admired this show of self-sacrifice and selflessness to the point Greninja as a Froakie went alongside Ash to face Garchomp. He respects those with these traits, as he does Ash. This is first shown when he took a hit for Ash's Pikachu during Team Rocket's attack despite not knowing Pikachu or his Trainer, and then proceeded to help them both in combat.
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Greninja seems to appreciate and respect bravery and selflessness, and as such, aims to be so himself. Greninja also seems to care deeply for his friends and would go to great lengths to keep them safe from danger. Greninja is a responsible Pokémon that can take initiative to protect his friends and allies. He is clear that it recognizes these traits in Ash, hence why he was finally willing to accept being taken into Ash's wing. Greninja is extremely similar to Ash personality-wise, as he is not afraid to leap into danger regardless of his own safety and doesn't back down from a fight.
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