Niwatori gave Weavile a powerful uppercut and sent the weasel flying.  Weavile flew into Smaug's attack and crashed into Venonat, knocked out from the two-pronged attack.  Venonat was knocked out as well after copping a Psychic and the brunt of Smaug's Flamethrower.  Zoro picked that moment to use Night Slash and break Blissey out, expanding his invisibility illusion to cover Blissey as well.