After receiving an Enigma Stone from a certain event, go to the museum at Pewter City and Steven Stone will be there. Show him the Enigma Stone and a scientist will examine it, which turns out to be some Soul Dew. Soul Dew will raise the Special Attack and Special Defense stats if held by Latias or Latios. Afterwards, go back outside and Latias will be waiting. Save your game before you interact. Latias is on Level 40. Its signature move is Mist Ball, which has a 50% chance of lowering the target’s Special Attack stat. If you use Pokémon of opposite genders, try using Love Balls to catch the opponent. After the battle, Steven will leave. ... https://www.youtube.com/watch?v=4QJVof_jIxk

Chili is one of the Unova Leaders in the Pokémon World Tournament that can be battled in either the Unova Leaders or World Leaders Tournaments. Chili is skilled in using Fire type Pokémon. When Simisear uses Overheat, the Fire Gem gives it extra power for once but it sharply lowers its user’s Special Attack stat. Heatmor will use Sunny Day to power up Fire type moves for 5 turns and Sucker Punch to strike first. Darmanitan will use Flare Blitz for big damage while hurting itself in the process and U-turn to switch out. Arcanine will use Extremespeed to strike first and SolarBeam with a Power Herb taking effect for once so the move can be used right away. Camerupt will use Stone Edge for critical hits and Explosion when in danger. Emboar has 3 different moves that give itself recoil damage. A move like Hydro Pump would work best for this battle. ... https://www.youtube.com/watch?v=b79Wik_ezGo

At Nacrene City, N will appear if you try to enter the museum and battle you for the 2nd time. For this round, he has some Pokémon that can be found outside the Pinwheel Forest. Pidove will use Quick Attack for first strikes. Timburr will use Focus Energy to heighten chances of critical hits and Low Kick on heavier foes. Tympole will use Supersonic to confuse opponents and slow them down with Bubblebeam. After the battle, enter the museum then the gym underneath it. ... https://www.youtube.com/watch?v=hU3LQUtA4oo

After you defeat Tabitha, you’ll take on the team’s leader, Maxie. Maxie is using a machine with the Meteorite fitted in so the volcano’s activity can intensify and expand the landmass. Battle Maxie and defeat him so that Team Magma will retreat. You can take the Meteorite out of the machine after the battle and give it to Professor Cozmo at Fallarbor Town later. ... https://www.youtube.com/watch?v=kE-ZAtWoyDM