Mega Raids in Pokémon Go pit you against a mega evolved form of a Pokémon. For Mega Charizard X, you face a formidable opponent, but it will earn you Mega Energy to turn your Pokémon into a Mega Evolved form. The faster you complete the raid, the more Mega Energy, also known as Mega Candy, is to transform them. Here's what you need to know.
Weaknesses of Mega Charizard X
Mega Charizard X is a Fire and Dragon-type Pokémon, which is different from its traditional Fire and Flying-type form. The X variant is weak for Ground, Rock, and Dragon type attacks. You'll probably want to focus on using a Ground or Rock-type Pokémon to destroy it.
Pokémon to counter Mega Charizard X
The best Pokémon you can use against Mega Charizard X include Groudon, Rhyperior, Tyranitar.
Groudon is among the most powerful Ground-type Pokémon you can use. He has a max CP of 4, attack of 115, defense of 270, and stamina of 228. He doesn't have exceptional defenses to fight Mega Charizard, but he should do the job to do a lot of damage. You want to make sure yours knows about the dragon's tail and the earthquake. Because Mega Charizard X is weak on dragon-types, your Groudon's knowledge of dragon tail means he can reach his weaknesses unaffected by any of X's dragon-type attacks.
Next, Rhyperior, the Rock and Ground-type Pokémon. It's another great choice to use against him, despite its variety of weaknesses. He has a max CP of 3733, attack of 241, defense of 190, and stamina of 251. Again, he doesn't have the best defenses, but he should be effective against standard X attacks. whether your Rhyperior uses slaps or slaps of mud with a troubleshooter. If you don't have one with its legacy, earthquake is another great option.
The final optimal choice is Tyranitar, the Rock and Dark-type Pokémon. He's in the same boat as Rhyperior in that he has excellent attacking abilities, despite a variety of weaknesses. Hopefully Mega Charizard X won't be able to take advantage of it. It has a max CP of 3, attack of 834, defense of 251, and stamina of 207. Ideally, you want yours to know a hit and a stone edge. Unfortunately, it's the best choices that make Tyranitar a good choice if yours knows his legacy. The other quick move choices, bite and iron tail, won't do well against Mega Charizard X.
If you don't have any of the above, there are several other choices. You can use Garchomp, Golem, Seismitoad, Camerupt, Gigalith, Regirock, Golem (Alola), Reshjiram, Zekrom, Rayquaza, Dragonite or Salamence.