After getting your starter Pokémon, you’ll first battle Bianca. She chooses the starter that’s weaker than yours. After the battle, the bedroom will become a complete mess then you’ll take on Cheren next. ... https://www.youtube.com/watch?v=yIa0RkOWYvw
At the Sunken Ship, guess the password and interact with a tentacle coming from a small pipe, which will trigger a duel with King Calamari. Take out the tentacles and you’ll advance to battle against more tentacles. After the tentacles are gone, you’ll take on the main body of King Calamari. King Calamari will summon sandstorms, unleash drain beams, spray ink blasts, and unleash some venom drool. The venom drool poisons the target but does no damage. After the battle, continue to navigate the ship.
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https://www.youtube.com/watch?v=xsmD-UxTsOs
Crasher Wake is one of the Sinnoh Leaders in the Pokémon World Tournament that can be battled in either the Sinnoh Leaders or World Leaders Tournaments. Crasher Wake is skilled in using Water type Pokémon. Floatzel will use Bulk Up to gain stats and Aqua Jet to strike first. Empoleon will use Featherdance to lower the target’s Attack stat and Grass Knot on heavier foes. Lumineon will use Icy Wind with an Ice Gem in favor to slow opponents down and U-turn to switch out. Gastrodon will use Stockpile to raise both Defense stats, Muddy Water to make opponents less accurate, and Recover when low on HP. Quagsire will use Curse to power up but slow down and Rain Dance to power up Water type moves. Gyarados will use Dragon Dance to speed up and Stone Edge for critical hits. Moves like Thunderbolt and Giga Drain are best uses for this battle.
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https://www.youtube.com/watch?v=Nto7FOtBQGo
On Saturday and Sunday between 3:00 P.M. and 5:00 P.M., Erika will be by a fountain at Celadon City just south of the department store. Talk to her and she will give you her phone number on the PokéGear. Call her on a Sunday morning and she will be at the Fighting Dojo in Saffron City. Shiftry will use Sunny Day to change the weather for 5 turns and Explosion to deal massive damage but make itself faint in the process. Jumpluff will use Sleep Powder to put the target to sleep and U-turn to switch out after causing damage. Victreebel will use Sludge Bomb for a 30% chance of poisoning the target and Leaf Blade to more easily land a critical hit. Bellossom will use Attract to make the opposite gender less likely to move and Giga Drain to restore its HP by half the damage the target took. Tangrowth will use Swords Dance to sharply raise its Attack stat and Rock Slide for a 30% chance of making the target flinch. Roserade will use Stun Spore to paralyze the target and Weather Ball that changes type depending on the weather. Moves like Flamethrower and Aerial Ace work best for this battle.
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https://www.youtube.com/watch?v=8dZ_Xbklco8
Fall at the start and you’ll find the “K” letter over an arrow barrel. When you jump, the wind below will start picking up to give you a lift. Go by a Kutlass and ascend in the wind by Zingers. After a Click-Clack, you’ll find the “O” letter between Zingers. After a Krook, do a spin left and go under a Zinger to find a B Barrel. The first bonus area has Flitter dragonflies. Defeat them all within 20 seconds for a Kremkoin. Back in the main area, ascend some more in the wind and you’ll find the Star Barrel. Go by some Krooks and float in the wind by some Zingers. After a Red Balloon, you’ll find the “N” letter. Float slowly under some Zingers before the next landing to get the DK Coin. Continue ascending in the wind by Zingers and you’ll spot a Spiny. Go up by Krooks and use a barrel to defeat a Kutlass so you can enter the next B Barrel. The 2nd bonus area has 80 stars in a bramble zone. Use Squawks to collect the stars and you have 15 seconds to get the Kremkoin. Back in the cellar, use the hook to float in the wind and drop onto the target with good timing for the “G” letter at the goal.
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https://www.youtube.com/watch?v=6FKNLOr2dbo
Marshal uses a full team of Fighting type Pokémon. New to his team are Lucario and Medicham. Lucario will use Extremespeed to strike first and Aura Sphere to strike without fail. Medicham knows all 3 elemental punching moves and Hi Jump Kick that causes massive damage. Every opponent else is the same but with altered movesets. Moves like Psychic and Aerial Ace work best for this battle.
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https://www.youtube.com/watch?v=gOVyA2MEOOM
During your post-game quest, go to an underground area at Victory Road and enter N’s Castle. N is there with Zekrom and he will challenge you to a battle. The only Pokémon he uses is Zekrom. After winning, N will bid farewell to the Pokémon he has been with 2 years ago and merge it into a Dark Stone. You’ll obtain this stone and use it at the top of the Dragonspiral Tower later.
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https://www.youtube.com/watch?v=YhWqDm_j-GQ
Team Galactic is causing trouble at Stark Mountain. As you enter the interior of the mountain, battle Mars for the 3rd time and after you defeat her, go after Jupiter next.
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https://www.youtube.com/watch?v=p0glzgbCXpo
On the 6F of the Pokémon Tower, you’ll witness a ghost of some sort just as you’re about to approach the stairs to the 7F. This requires the Silph Scope that is obtained after defeating Giovanni in the Team Rocket HQ. Using the Silph Scope, this will reveal the identity of Cubone’s deceased mother. Marowak is on Level 30. Because it inhabits the spirit of the ghost, it cannot be captured regardless of any ball you throw so you have no choice but to defeat it. After you defeat it, its soul will depart to the afterlife.
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https://www.youtube.com/watch?v=ZB_F4uVCLUE
Once you enter the Elite Four, there’s no turning back and you must beat each one in a row. Starting with the first one, Lorelei is skilled in using Ice type Pokémon. If Dewgong runs out of HP, it will use Rest to fully recover. Cloyster has high physical Defense and will use Clamp to immobilize targets by repeating the move for 2-5 turns. Slowbro will become more defenseful by using Withdraw and Amnesia. Lapras will be the hard part as it uses Confuse Ray to confuse then Body Slam to paralyze. It also knows Blizzard that causes massive damage and can sometimes freeze targets. A move like Thunderbolt will easily work best for this round.
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https://www.youtube.com/watch?v=yMWFJ0jNj4w