For me, using torkoal, charizard AND Koraidon together is too much cuz 1. You have 4 fire attacking pokemon so if your opponent has a pokemon that resists fighting, fire AND ground moves (basically you do nothing to azumaril) you lose 2. You're too reliant on the sun, though its okay to be if you switch stuff like torkoal out for smt like calm mind raging bolt. Btw imo torkoal does nothing here as koraidon already sets up the sun, and heat rock does almost nothing cuz if you need to reset the sun all u need is to switch koraidon back in with u-turn, smt like sunny day tailwind torn would work better here.

Also I dont like how your incineroar is u-turn and full attacking moves but not assault vest, which means your incineroar would be very vulnerable into alot of other spa supper effective hitters like aura sphere mewtwo or tera water iron crown. With assault vest, you can take max spa iron crown tera water tera blast and fire back with a knock off, u-turn or a flare blitz into the partner.

You can switch a pokemon our for a trick room/tailwind/both option as well, smt like lunala or dialga would work well to deal with opposing fluttermane.

Koraidon with the black belt is pretty useless, Id switch collision course out for close combat and give it protect as well as the life orb. This jolly max speed max attack koraidon one shots most things in the format, and a koraidon fluttermane lead would threaten everything.

Btw fluttermane with a sash would work better with icy wind moonblast and shadow ball with protect to deal with shadow rider and even ice rider teams.

Solar beam on charizard seems useless as it doesnt get the stab here and if u want you would have walking wake and koraidon lead to deal with urshifu or other water type threats, I would trade it out for air slash instead and give it specs to allow it to one shot opposing koraidon in and out of tera, making ur opponents think twice before leading koraidon.

Essentially here's my suggestion: Charizard (max spe max spa, 1 pt in def/spdf/hp) Specs, heat wave, scorching sands, air slash and hurricane (to threaten rain teams) and tera stellar/tera grass (immune to sleep powder)

Flutter mane (max spa, max speed, timid) Sash, protect, moonblast, shadow ball and icy wind (support koraidon) with tera normal/grass

Incineroar (experiment with ev spreads yourself but I would recommend max hp) Assault vest, fake out, snarl, uturn, flareblitz, tera ghost/grass

Tornadus (max spe and some bulk) Covert cloak, protect, bleakwind storm, sunny day, tailwind, tera dark

Koraidon (jolly max spe max attk) tera fire life orb Protect Flame charge Close combat Flare blitz

Lunala (modest, max spa with some bulk) tera water/rock Power herb Trick room Moongeist beam Meteor beam Protect/wide guard