Reaching the summit means a long climb up the mountainside. Be sure to collect TM48 (Skill Swap) and the Max Potion before moving on.
When you reach the summit, you are finally able to catch up to Team Aqua. Show no mercy to the four Grunts lining the path as you advance northward. Upon reaching the mountain's highest peak, Archie informs you that Maxie and Team Magma beat them to the summit, but he also got what he wanted, and steals the Red Orb from its altar! Like your last meeting atop Mt. Chimney, he doesn't have much time to waste on you. He orders his team to fall back, and the group disappears in an instant. Afterward, the elderly woman caretaker tells you that the two Orbs belong together and must never be separated as they are now. She says that although Team Magma showed up first and was able to steal the Blue Orb, they left something behind in their haste. She gives you the Magma Emblem, in the hopes that it may be useful.
Route 123 (optional)
Route 123 slopes downhill as it runs westward, from Route 122 back to Route 118. Before heading onto this route make sure you that to have Pokémon on your team know Cut, and also has at least one Grass type pokemon.
Having received the Magma Emblem from the caretakers atop Mt. Pyre, the next step is to use it. Fly back to Lavaridge Town and Route 112, then either enter Jagged Pass from the south and use the Acro Bike to scale the cliffs, or ride the cable car to the summit and descend. Hike through the area until you reach the halfway point, where you passed that Magma Grunt on your first visit. Just then, a suspicious-looking part of the cliffside begins shaking in response to the Magma Emblem. By the time the tremor subsides, a gaping hole has appeared in the rock!
Magma Hideout, 1F
Magma Hideout, 2F
Magma Hideout, 2F (Room 2)
Magma Hideout, 3F
Magma Hideout, 3F (Room 2)
Magma Hideout, 4F
Magma Hideout, 3F (Room 3)
Magma Hideout, 2F (Room 3)
Located deep in the side of Mt. Chimney, the Magma Hideout serves as the terrestrial team's base of operations. Many strange machines can be found inside, and one chamber even holds excavation equipment for further expansion.
Enter the base, turn the corner, and use Strength to move past the group of boulders. Continue on to battle the Grunt on the east side of the chamber, then take the southeast doorway.
Make your way down the cliffside, battling four more Grunts along the way. After that, head through the mid-level doorway to detour for a handful of items.
2F (Room 2)
Go north to fight a couple of Grunts in a Double Battle, then collect the Full Restore just beyond them. Head back south, then turn east to battle another two Grunts and grab the Max Elixir to the northwest. Continue eastward and head through the northeast doorway.
Back on 1F, follow the elevated path to the southwest, battling a single Grunt along the way to the path's end, where you find a Rare Candy. Backtrack through 2F (Room 2) to the southwest doorway to return to 2F.
Continue down the cliffside and go through the doorway at the bottom.
Head west around the lava pool to battle the first Grunt. Walk down the stairway and go through the doorway to the east.
3F (Room 2)
Pick up a PP Max to the northwest and battle the Grunt to the northeast, then return to the previous chamber.
Walk down the stairway and fight the second Grunt. Go west and collect the Nugget before heading south through the doorway.
Head down the stairway and go west, battling three more Grunts along the way. Continue westward and you are stopped by Magma Admin Tabitha. He tells you that Maxie is up ahead, and draws you into battle to buy some time for his boss.
Collect a Max Revive from the northwest corner, then turn south. Up ahead, you find Maxie standing on the edge of a lava pool, talking to the sleeping form of the super-ancient Pokémon, Groudon. He holds the Blue Orb high, and its light awakens the ancient beast, which immediately escapes. Maxie blames you, accusing you of some "cheap stunt", and prepares for battle!