The only way to access it is by taking the Rainbow Stoneship from the Hidden Land. Additionally, the only Pokémon allowed to enter are the hero and their partner as a duo. Lapras will bring the hero and partner to the Hidden Land, which must be completed before entering Temporal Tower.
Temporal Tower has a waypoint after 13F. On the first visit, the player will have to defeat Primal Dialga. After that, the player can recruit Dialga in its regular state.
Gameplay
Main game
The floors are ranked E, ★1 and ★2 for the purpose of Treasure Boxes and friend rescues.
Despite being the last dungeon before the credits roll, the dungeon's floor layouts are on average simpler than Hidden Land's. Specifically:
Small layout on floors 1, 2, 6, 7, 11 and 12 of Temporal Tower, and floors 3, 4, 8 and 9 of Temporal Spire. These floors will have 2 to 6 rooms.
Medium layout on floors 3, 4, 8, 9 and 13 of Temporal Tower, and floors 1, 5, 6 and 10 of Temporal Spire. Most of these floors will have 3 to 8 rooms, except for the 1st floor of Temporal Spire which can have up to 9.
Large layout on floors 5 and 10 of Temporal Tower, and floors 2 and 7 of Temporal Spire. Floor 5 of Temporal Tower and floor 7 of Temporal Spire can have anywhere between as few as 3 to as many as 18 rooms. Floor 10 of Temporal Tower can have 3-12 rooms, while floor 3 of Temporal Spire can have 3-10 rooms.
There are usually 2-3 starting enemies on first five floors of Temporal Tower, and 2-4 enemies on later floors. There are 1-4 items on first three floors of Temporal Tower, 2-5 items on floors 4 through 10 of Temporal Tower, and 3-6 items on later floors.
The IQ Booster activates on every even floor (counting Temporal Spire as a continuation of Temporal Tower). The turn limit is 1000. The player is forced to use the hero and partner even during subsequent visits, including losing when the partner is knocked out. The player cannot be rescued if knocked out in Temporal Spire. The enemies in this dungeon have 26IQ, granting them the Status Checker IQ skill. There is light darkness in the dungeon. Floors 3, 5, 7, 11 and 12 of Temporal Tower, as well as floors 3, 5, 7 and 9 of Temporal Spire, feature water, although it might be surrounded by walls on small floors. Floors 4 and 9 of Temporal Tower have sunny weather.
Dialga has 600IQ when fought, granting it access to many IQ Skills such as Intimidator and Quick Dodger.
In the Special Episode, the following layouts are used in both Temporal Tower and Temporal Spire.
Small-sized on floors 1, 2, 6 and 7. These floors will have 2 to 6 rooms.
Medium-sized on floors 3, 4, 8 and 9. These floors will have 3 to 8 rooms, except for Temporal Spire's floor 4, which can have up to 9 rooms.
Large-sized on floors 5 and 10. Floor 5 of Temporal Tower and floor 10 of Temporal Spire can have as few as 3 and as many as 18 rooms. Floor 10 of Temporal Tower will have 3-12 rooms, while floor 5 of Temporal Spire will have 3-10 rooms.
There are usually 2-3 starting enemies on the first five floors of Temporal Tower, and 2-4 enemies on later floors. There are 2-5 items in Temporal Tower, and 3-6 items in Temporal Spire.
The enemies in this dungeon have 26IQ, granting them the Status Checker IQ skill. The turn limit is 1000. There is light darkness in the dungeon. Floors 3, 5 and 7 of Temporal Tower, as well as floors 1, 2, 5 and 9 of Temporal Spire, feature water, although it might be surrounded by walls on small floors.
Deoxys's Defense Forme appearing as a mirage within Temporal Spire.
Like in the previous game, a tower is the final dungeon of the story mode. However, other Pokémon besides the hero and partner cannot be taken to Temporal Tower, unlike Sky Tower.
At the waypoint, Temporal Spire, and when at Temporal Pinnacle, one can hear a clock faintly ticking in the background: this and the location's name are likely due to the fact that Temporal Tower is the structure of time.
The Temporal Pinnacle, where Dialga is found, bears a striking resemblance to the Spear Pillar (where Dialga is also found).
The 24 floors of this dungeon may be a reference to the 24 hours of the day.
Only the hero and partner can ever come to Temporal Tower. Ironically, that means that if Dialga is recruited by the player, the only way it can return to Temporal Tower is if it is released.
Curiously, if one takes notice of the Pinnacle, the pillars in the past (both during the battle against Primal Dialga in the main story and against Dialga post-story) and the future are swapped.
The Deoxys forms that can be encountered within Temporal Spire while holding a Mystery Part or Secret Slab in the Treasure Bag appear as semi-transparent mirages, matching the Deoxys mirages found within Meteor Cave in Red Rescue Team and Blue Rescue Team. It was similarly not possible to recruit the Deoxys mirages in the previous games.
With considerable luck, it is possible to encounter the Deoxys mirages even during the main story, as the Mystery Part or Secret Slab can be obtained prior to the ending. All other Legendary Pokémon encountered in this manner require the player to have graduated or to have unlocked the Marine Resort.
All of the three Deoxys forms are technically set to appear on 5-10F of Temporal Spire. However, as each form can only appear once in a set order and always appear on the floor immediately upon entering 5-7F, it is only possible to encounter the Deoxys mirages on 8-10F in Explorers of Sky by using a No-Slip Cap to turn the item sticky, and cleaning it after passing 5F and 6F by using a Cleanse Orb.
