I sense that Reshiram could have a niche due to the fact that tons of people are using Magearna, Zacian-C, and the Alola Legends. With a set consisting of: Blue Flare, Earth Power, Dragon Pulse/Draco Meteor, and Shadow Ball, with 252 Special Attack EVs, 252 Speed EVs, Reshiram can hit all the Ubers super effectively. With a Choice Scarf, It can outspeed The Alolan Legends, Cinderace, and tie with Eternatus and Mewtwo. With some Choice Specs it can KO Pokémon that it couldn't before, since it doesnt need a Scarf to outspeed Magearna, Excadril, Incineroar, and Amoonguss. Turboblaze will ignore all other Abilities, Including Prism Armor and Shadow Shield, Making it a hard Pokémon to switch into. Since it is a Dragon-Fire type, Its a dragon who is not threated by Fairies. It can even live a +1 attack from Zacian-C and Magearna.
Although, Reshiram will have flaws. Even with a Scarf, it can't outspeed Zaican-C, Dragapult, and Scarfers Above base 90, and since it needs a Choice item to not be useless, it can be switched around easily. Blue Flare's accuracy is only 85%, so it could lose to Zacian if one misses. Reshiram's type makes it weak to Ground, Rock, and Dragon. If Reshiram is not Scarf, its weak to Pokemon like Scarf Excadrill, Scarf Tyranitar, Eternatus, Earth Power Mewtwo, and Both Kyurem Black and White, making its type more of a double edge sword. Stealth Rock will also make it hard for Reshiram to switch in. If it is Paralyzed, it will be useless, especially if its Specs.
Overall, Reshiram has a ton of good and bad traits for the meta, so untrained players cant get its full value, but if wielded by a smart player, the power it brings to the table can wreck unprepared teams that count on their Zacian, Magearna, Solgaleo, Necrozma-DM, Lunala, or Amoonguss too much. What do you think about Reshiram in the meta? Will it be good or bad? Please let me know!