At Ecruteak City, enter the Burned Tower and you’ll meet your rival there. For the 3rd battle, Magnemite is added. Magnemite will use Thunder Wave to paralyze the target and Supersonic to confuse. After the battle, go to the basement to meet the legendary beasts. ... https://www.youtube.com/watch?v=POHfVhPomVE

There are long tunas and octopuses coming from the water, so be sure to watch for them as you use the cloud platforms to cross. Defeat some snails and ride the platforms that move sideways. Continue crossing with the cloud platforms as octopuses and long tunas keep appearing. Defeat a dancing kitty and a fairy will appear from the next egg. When a ninja appears from behind, rocks will start rolling by. Continue crossing the platforms, and after seeing a flock of crows, you’ll reach the goal. ... https://www.youtube.com/watch?v=TArXRccU8i8

At Seafoam Islands, the gym of Cinnabar Island has relocated there after the original gym perished in an eruption long ago. Interact with some trainers and battle them so that they clear the path. After defeating every original trainer, you’ll be able to take on the gym leader. Blaine uses Fire type Pokémon. Magcargo will use Sunny Day to change the weather for 5 turns and Smog for a 40% chance of poisoning the target. Magmar will use Confuse Ray to confuse the target and Thunderpunch for a 10% chance of paralyzing the target. Rapidash will use Quick Attack to strike first and Flare Blitz to deal a lot of damage at the expense of its own HP. After the battle, you’ll receive the Volcano Badge and a TM50 (Overheat). Overheat deals massive damage but sharply reduces the user’s Special Attack stat after it deals damage. ... https://www.youtube.com/watch?v=AJaPhollf2U

After receiving the National Dex, go back to Snowpoint City and enter the Snowpoint Temple. Go to the lowest floor of the temple and you’ll see Regigigas. To awaken Regigigas, you need all 3 of the Regi Trio in your team. If you have Regirock, Regice, and Registeel with you when you interact, you’ll awaken this Pokémon, but save your game first before doing so. Regigigas is on Level 1 in this version so make sure you have a Pokémon that knows False Swipe. Regigigas has an ability called Slow Start, in which it has only half its Attack and Speed for the first 5 turns upon entry to battle. Dusk Balls are recommended. If Regigigas reaches Level 75, it will learn its signature move called Crush Grip. Crush Grip inflicts damage depending on the target’s HP. ... https://www.youtube.com/watch?v=4N3evNeTTAg