Am I Ready For The Ho-Oh Challenge?

I just finished purifying all 48 Shadows and I’m about to take on the Battle Mode Mt. Battle challenge for Ho-Oh but I wanted to check and make sure my team is ready before I invest a few hours and fail at level 83 or something. My team is:

Raikou (Level 68, should probably give him Leftovers if they’re available)
* Rain Dance
* Thunder
* Crunch
* Reflect

Suicune (Level 66, holding Mystic Water)
* Rain Dance
* Mist
* Surf
* Ice Beam

Flygon (Level 67, holding Soft Sand)
* Earthquake
* Dragonbreath (probably going to replace with Dragon Claw)
* Crunch
* Steel Wing (for the occasional ice type)

Altaria (Level 70, holding Nevermeltice)
* Ice Beam
* Flamethrower
* Dragon Dance (should probably replace it since she has no physical moves and her special attack is higher anyways)
* Safeguard

Tyranitar (Level 66, holding Hard Stone)
* Rock Slide
* Thunder
* Earthquake
* Crunch

Metagross (Level 66, holding Twisted Spoon)
* Hyper Beam (Because it is very funny)
* Meteor Mash
* Psychic
* Iron Defense

Should I grind everyone to level 70, replace some moves, do knockout challenges for TMs? Or just go for it from here? And either way, singles or doubles?