User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-3062343-20130915003858/@comment-3062343-20130915005011

The CA I'm using at the moment can upgrade into the Rathian or Zaboazagiru CA, but they're unlocked after beating Neru. From what I've heard, the Insect Rod is similar; Neru is the first monster you fight that has an IR, so you're stuck with the starting IR for a while