Flame-filled Eyes: Quest For the Magmarizer

In a remote area of this Route, there is a cave. Inside the cave there is a family of Magby and Magmar who are lead and kept protected by a Magmortar. You've probably already guessed by the name of this thread that this must be the place where you can obtain the Magmarizer and you'd be right. But of course, this isn't no ordinary Magmortar. It is always wanting to challenge everything it sees and effectively takes any gesture of kindness as an invitation to begin the battle. The problem is that no-one has documented seeing the cave and there isn't a sign saying where it is. Rumour says its somewhere in this route, but where?

You must have access to both HM 03 Surf and HM 08 Rockclimb in order to attempt this quest. Should you defeat the Magmortar, you will receive an Magmarizer. You may also receive a Pokémon Egg as well. If you wish to attempt this quest, please say so when entering the Route. Note: Under no circumstances is the Magmortar able to be captured.