Description: Sacred Fire is the main attack Ho-Oh will be using, and, when backed by STAB and sunlight, it outright OHKOes many Pokemon in the Uber tier such as Mewtwo, as well as at least 2HKOing anything that does not resist it. Brave Bird, Ho-Oh's other incredibly potent STAB move of choice, nails Kyogre, Reshiram, and Palkia for assured OHKOs after Stealth Rock damage. Brave Bird also provides Ho-Oh with a very strong sweeping attack in case the weather is not in its favor. Roost rounds out the set brilliantly to help Ho-Oh recover damage incurred from Stealth Rock and Life Orb, as well possibly allowing it to gain multiple Flame Charge boosts or to set up Tailwind repeatedly.
Options: Choosing between Flame Charge and Tailwind is tough. Flame Charge's Speed boost will last until Ho-Oh switches out, and it also allows Ho-Oh to soften up the opponent's Ho-Oh check with a light smack before going on the offensive. However, Tailwind offers a significantly higher Speed boost.
Add some Sunlight to power up Ho-Oh's STAB Sacred Fire and you'll have a very deadly sweeper on your hands.
Counters: Ho-Oh has no true counter as nothing can safely switch in on its devastating attacks. Only smart prediction and having the right combination of resistances will bring it down.
That said, Rock Arceus is probably the closest thing Ho-Oh has to a true counter. It resists both Sacred Fire and Brave Bird, has the bulk to take multiple hits, and can OHKO Ho-Oh with a swift Judgment.
This is a good moveset for ho-oh (Pokemon #250) with the pressure ability/trait, a Adamant nature, and equipped with Life Orb submitted by Venustoise. For use in competitive Pokemon battles featuring an Export option and breeding guide.