Pokémon Theory: What's With Shiny Ash-Greninja?

Since greninja its my personally favorite Ash mon of all time, and i like to hc possible friendships between Ash mons, which pokemon of Oak lab you think greninja would get along

Ash's Greninja - Bulbapedia, the community-driven Pokémon encyclopedia

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AZ Floette power is the same from Ash Greninja? [Game Spoiler] : r/pokemon

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Pokémon Theory: What's With Shiny Ash-Greninja?

I should apply to Koga's gym fr fr. : r/pokemonradicalred