Kirby vs Greninja

To effectively play Kirby against Greninja, capitalize on your aerial mobility by utilizing Up Special to gain height and pressure Greninja from above. Spam your Down B to catch Greninja off-guard, especially during his recovery or when he attempts to approach. Use Neutral Air to disrupt his attacks and create openings, and always be prepared to air dodge to avoid his water shuriken and follow-ups. Remember, Greninja's slower ground speed makes him vulnerable to your hammer attacks, so keep hammer spamming whenever you can to maintain pressure and control the match.