They don't actually have what it takes to full on kill him though. But yes they could incapacitate him.
__________________ Chicken Boo, what's the matter with you? You don't act like the other chickens do. You wear a disguise to look like human guys, but you're not a man you're a Chicken Boo.
..kay. Well I suppose it comes down to if they can freeze him before he turns into something the size of a skyscraper.
__________________ Chicken Boo, what's the matter with you? You don't act like the other chickens do. You wear a disguise to look like human guys, but you're not a man you're a Chicken Boo.
In these types of situations it's best to resort to Pokemon rules.
Plastic Man can both melt and freeze so we can conclude he's a grass type. Which means that most of the Sinister 6 will be largely ineffective or will just do normal damage. Plastic Man is a good 10-20 levels higher as well.
However Vulture will be super effective against him and his speed stat is higher. So this all boils down to whether or not you think a Pokemon 20 levels lower can win with some distractions and a type advantage.
Vulture can conceivably solo (in the damage aspect) as long as he gets cover.