After you receive the Dark Stone, go to Route 8 and once you’re about to go to the entrance to the Tubeline Bridge, Bianca will appear for a 5th battle. Her team has fully evolved this round. After the battle, cross the Tubeline Bridge and make your way into Opelucid City. ... https://www.youtube.com/watch?v=4Uml8rXFsU4
As you’re on Route 7 and about to approach the stairway to Twist Mountain, Cheren will show up to battle you for the 6th time. For this round, his Tranquill and the elemental monkey have evolved. Unfezant holds Scope Lens and its Super Luck ability can cause critical hits more often that it could. When Liepard uses the Sitrus Berry it holds, it will gain Speed due to its Unburden ability. The opposing starter holds Leftovers that slowly restores HP every turn. After the battle, Alder will arrive to check on your progress and give you an HM03 (Surf). With Surf, you can cross water. Try using it on Route 6 for example.
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https://www.youtube.com/watch?v=NMEj3Z1_9So
On the 5th floor of the Unknown Palace, navigate a secret passage and you’ll find a treasure chest containing a Wild Rose. After you obtain it, a Lucifer will ambush you. If it attacks your fighters physically, it will drain their health to add to its own. Blink and protection spells would be recommended to alleviate the damage taken so that the Lucifer absorbs less. Fire, ice, and lightning spells will have no effect against it. Be sure to use some berserk and protection spells to keep the battle going. After the battle, explore more of the palace.
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https://www.youtube.com/watch?v=CeQV3PdDm_o
Norman is one of the Hoenn Leaders in the Pokémon World Tournament that can be battled in either the Hoenn Leaders or World Leaders Tournaments. Norman is skilled in using Normal type Pokémon. Slaking has the Truant ability in which it cannot move on consecutive turns. Ambipom will use Fake Out with a Normal Gem to strike first. Bouffalant will use its signature move Head Charge but hurt itself when the move strikes and Stone Edge for critical hits. Staraptor holds a Choice Band to power up physical attacks but can only use one move. Exploud will use Hyper Voice and Blizzard to strike multiple opponents. Sawsbuck will use Horn Leech to steal HP from an opponent and Rest with a Chesto Berry to support. A move like Aura Sphere would be the best use for this battle.
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https://www.youtube.com/watch?v=ii3jhTeZjUU
There are ghosts aboard the Phantom Train that may attack if interacted with. The Ghost will focus mainly on fire spells, and it can cast a time freeze, which gives the target the stop condition. The Ghost is weak against fire, holy, and healing spells. After you defeat it, continue to navigate the train.
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https://www.youtube.com/watch?v=dOKN6aseSpc
On Route 44, a fisherman named Wilton is there. After you defeat him, you have the option of registering him in the PokéGear, and if so, he might find outbreaks of Remoraid.
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https://www.youtube.com/watch?v=ZxFbpA3qT8U
On Mt. Chimney, Team Aqua and Team Magma are battling after previously meeting at Meteor Falls. Team Aqua has stolen the Meteorite Professor Cozmo retrieved earlier. Battle some grunts then you’ll take on Matt next. After you beat Matt, go after the team’s boss.
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https://www.youtube.com/watch?v=NEutKG448WY
Glacia uses Ice type Pokémon. The first Glalie will use Light Screen to weaken special attack damage for 5 turns. The first Sealeo will use Ice Ball that gets stronger every turn for up to 5 turns. The 2nd Sealeo will use Attract to immobilize opposite genders then Dive to avoid attacks the first turn while striking the next turn. Walrein will use Sheer Cold to take out opponents in one hit but won’t work against opponents at a higher level. A move like Brick Break would work best for this battle.
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https://www.youtube.com/watch?v=s2tAxvTiQ6U
On Route 8, there are 3 bikers just in front of the entrance to the now-closed Underground Path. Dwayne uses 4 Koffing, Harris uses a single Flareon, and Zeke uses 2 Koffing.
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https://www.youtube.com/watch?v=9FcFAdk_sd0
After visiting the Cave of Being, go to Nacrene City by the museum and Uxie will descend. Save your game before you interact. Uxie is on Level 65. Use Ultra Balls or else wait till night to use Dusk Balls.
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https://www.youtube.com/watch?v=sEQViOkQ_Mg