The Mount Gundor floors up to the peak are mountainous in nature, with steam crevices along the edges of the walls, and geysers being used to advance up the mountain. The gate key used for this portion of the dungeon is the Magma Stone, and getting through blocked paths requires the Stone T. After traversing to the peak, the passage to the mouth of Mount Gundor will be more cave-like and filled with lava. The gate key used is the Rope, and getting through blocked paths requires the White Wind Vase.
From Mount Gundor and onward, the time trial medals are very easy to obtain, as every floor is given lots of time to defeat every monster, collect abs and gilda, and open every chest. As long as you aren't needlessly wandering around the map, you should be fine.
As always, bringing along Improved Bombs helps deal with many enemies, but in Mount Gundor, the Improved Bomb begins to lose its effectiveness, as some enemies require many hits before being taken down. Using Final Bombs will give the extra punch needed for some of the larger enemies. Various Elemental Stones can help deal with enemies that have an elemental weakness, and undead enemies can be dealt with Holy Water. Heart-Throb Cherries can help stop flying enemies such as the Stick Joe and the Gundrons, and everything else can be taken down with Poison Apples.
Spheda in Mount Gundor is extremely tedious and can be difficult. There are lots of areas where it can go off course, including the edges of the walls, and various steam or lava-filled holes. The walls and edges are jagged as well, and bouncing off them can be very inconsistent. Despite this, there is a benefit that lots of shots are often given, so taking small and carefully planned shots with the Turkey is usually the best way to not waste them. Additionally, the use of backspin can help prevent overshooting the ball into a hole.
For the boss battle with the flying battleship, see Death Ark.
The peak of Mount Gundor has the Fire Squall, which has been raining embers over Heim Rada. If you haven't progressed much in the georama, you won't be able to destroy it, but if you have progressed, head to the future to obtain the Time Bomb from Garek. Planting the Time Bomb will destroy the Fire Squall, and allow you to build flammable (non-metal or non-brick) structures in Heim Rada.
After destroying the Fire Squall, Gaspard's flying battleship, the Death Ark, will appear and try to directly attack you. Monica will prompt Max to use the Ridepod, since it is their only means of counterattack. Be warned, this will be your last chance to snapshot a scoop of the flying battleship, so make sure to take a picture of it. You will also lose Monica for a short while after defeating it, but it will not inhibit time traveling via the time gate at georama sites.
Initially, the road to the mouth of Mount Gundor is blocked by a river of magma, and cannot be crossed until you nearly finish the georama. Head to the future to obtain the Fire Horn from Galen Agaris, and use it to clear the lava blocking your path. Taking a snapshot of the path and the fallen battleship inside the mouth will earn you scoops.
Inside the mouth, Gaspard will be present, alongside an unconscious Monica. Gaspard will engage with Max in a duel, and after defeating him, Monica will awaken. Gaspard will begin to have a change of heart, but Griffon forces him to fight, and transforms him into a giant monster. Take a snapshot of Gaspard's ultimate form for an additional scoop; defeating him will result in Gaspard's death and the completion of Heim Rada's georama.