A1: To defeat the rattlecrab when he charges up with his claws you keep shooting them,you will soon hit him,when they are destroyed it will either go onto his spots on his back or the gun under his chin to destroy both of do the same thing of what you did with his claws then it will go onto his tail once thats destroyed you have killed him.Dont be fooled this is alot harder than it sounds!

A2: Guys When I Fighting Rattlecrab It Always Error?