When you enter Mt. Moon for the first time, you’ll meet your rival there. For the 6th battle, Haunter and Kadabra have evolved. After the battle, try exploring Mt. Moon for a little while and you might find a Clefairy. ... https://www.youtube.com/watch?v=IAoqyuAWec8
Cerulean City’s gym leader, Misty is an expert on Water type Pokémon. Starmie will be the hard part as it has great speed and it will use Harden to raise its Defense stat. After winning the battle, you’ll receive the Cascade Badge and a TM11 (Bubblebeam). Bubblebeam can sometimes lower the target’s Speed stat.
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https://www.youtube.com/watch?v=t0Y-QSobZfA
When you enter Mt. Moon for the first time, your rival will be there and challenge you to a battle for the 6th time. For this round, Haunter and Kadabra have evolved. After the battle, explore Mt. Moon a little.
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https://www.youtube.com/watch?v=9dshg3vjHkc
Marshal uses Fighting type Pokémon. Throh will use Storm Throw to always get critical hits along with Bulldoze and Rock Tomb to lower the Speed stat of opponents. Sawk will use Rock Slide to make opponents flinch. Mienshao will use Bounce to paralyze opponents and switch out by using U-turn. Conkeldurr will use Bulk Up to raise its stats and Stone Edge for critical hits. A move like Psychic would be good for this battle.
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https://www.youtube.com/watch?v=2LZXRpQKJ1U
After getting the Necromancer job, a lady will emerge from a door that leads to the Cloister of the Dead. Interact with the soul and you’ll battle against a Mindflayer. If damaged by any attack, the Mindflayer will counter by using a mind blast, which damages one target and paralyzes it. The Mindflayer can also use a blaster, which will bring the target down in one stroke. Let the Necromancer job class defeat the Mindflayer and Drain Touch will be learned. After the battle, you can enter the Cloister of the Dead to undertake a boss rush.
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https://www.youtube.com/watch?v=cUD4zlJbhTY
After your quest at the Spear Pillar, return to Lake Acuity and go into its cavern. Save your game once you’re in front of Uxie. Uxie is on Level 50. It will use Amnesia to raise its Special Defense stat and Yawn to make opponents sleep the next turn. Since you’re in a cave, Dusk Balls will work well. Uxie has a good source of Defense and Special Defense.
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https://www.youtube.com/watch?v=dvH38iE1daY
At the start, you’ll see a monster riding an ostrich plus some birds. After a moth, use bombs to blow up cracked tiles. Underground, use bombs to blow up the cracked boxes and go by 3 Clefairy to go up the ladder. Go down the next ladder then you’ll see a monster between holes. Go up another ladder then back underground again to blow up a cracked wall with bombs. Go up one more ladder and enter the door to the boss room. Hit the Team Rocket duo with objects 3 times to get the jewel and open the Mask Gate.
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https://www.youtube.com/watch?v=1M-G86kb4-M
This requires an Aurora Ticket that can be obtained via Nintendo Event. With the Aurora Ticket, go to the boatyard at Lilycove City and you’ll ride to Birth Island. At Birth Island, interact with the triangle and keep following it until it becomes red. Once it becomes completely red in the center, save your game in front of it. Interact while it’s red in the center and Deoxys will appear. Deoxys is on Level 30. After you capture it, Deoxys will transform into its Speed Form. If Deoxys reaches Level 45, it will learn its signature move Psycho Boost, a move that sharply lowers the user’s own Special Attack when it strikes.
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https://www.youtube.com/watch?v=_dvdxu_GDsM
Use the bounce lines to cross over the pale green grass, because stepping into the lighter grass causes a Lakitu to put you at a random spot of the track. After making some sharp turns, you can choose the path of using speed zippers to pick up some speed or use the path with item squares. Complete 5 laps to finish.
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https://www.youtube.com/watch?v=7MrTOyL2hCs
After obtaining the Basement Key, go to the underground area of Goldenrod City to open a locked door. Once inside the underground warehouse, your rival will stop by and have a battle with you. For the 4th battle, Zubat and Gastly have evolved. Also, new to his team is Sneasel, which was seemingly stolen from another trainer living in Cianwood City. Sneasel will use Icy Wind to lower the target’s Speed stat and Faint Attack to strike without fail. After the battle, navigate the underground area by pressing the switches to adjust the shutters.
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https://www.youtube.com/watch?v=eFAOWdlhmMk