Berserkory acts almost the same as his original form, performing a medium-strength attack and firing a Wave Attack. However, the Wave Attack range has been tripled, so few Cats can avoid it. He only has one knockback and very high health, causing even more Wave Attacks if you don't use any anti-Red Cats. Luckily, he has lower range and movement speed, not to mention the lack of Base Destroyer.
If you have iCat, then deploy two of them out of sync. In doing so, you will render Berserkory powerless (granted there aren't any other main attackers for support that could demolish them), which you can then finish off easily. Wave Shields such as Octopus Cat and Cat Machine Mk 3 are very effective at blocking Berserkory's Wave Attacks, allowing your units to get in close and destroy it. iCat, if paired with Octopus, pretty much nullifies Berserkory entirely.
An eccentric koala who woke up to cooking at Battle Cat's [Axe Cat's] house while freeloading there. Only uses gourmet ingredients, so he was kicked out once again. At last, dyed by the setting sun, he has awakened to the secret of the "wave".