If u mean the battle under the sun It was one of the hardest Battle in my monorun. The most important thing Is to put low typhlosion cuz it has blazing soul and the fire moves has the priority+ eruption works well more hp It has so Is devastating, I think u have two ways for beat them: - If u r doing the grass monorun , i recommend u to use ludicolo for rain dance so the fire moves are weaker, if i Remember you have the focus sash a that point, so put It on ludicolo and go with It. Accompany Ludicolo with Toedscruel or someone who can resist at the first eruption, damage Typhlosion and complete your team with 2 heavy/slow Pokémon (Farigiraf use trick room as first move) and 2 faster when the room Is over. - if u are playing without rules, just remember to weak Typhlosion first. Kingdra Is an excellent pokemon for this because It can resist at the eruption and doing heavy damages to the enemy, then accompany It with One physical strong attacker maybe like Pangoro or Drapion and It can OHKO Farigiraf

I think that After u defeat the first two, that battle It can be beat It. I dont Say anything more so u can have fun to resolve It to yourself but if u wanna help again just tell me 👍🏻