In Mahabharata, Krishna never took weapons because Pandavas and other people are his weapons.Krishna never fought seriously may be with Satyabhama for giving Pareja da flower to Ruck mani. He never wanted to fight also with seriousness.The only place where he got anger and sent Sudarshan chakra , when sisu Bala insulted him.That too after 100 mistakes only.Even against Bhishma, he threatened only by carrying the wheel in his finger.He knows all tricks to pacify 16000 women and a darling of his subjects.Therefore his only weapon is mischievous smile.