Sub+3 attacks Ho-oh. It can run another attack over Roost since it will basically use Sub while forcing switches. Yes Wobb can come in on a lot of stuff, but it will not like eating two consecutive Sacred Fires when ho-oh puts up a sub to hide behind, shielding it from Counter or giving it a free turn to avoid custap-bond. Kyogre also really hates LO Brave Bird, and as long as you give him spin support regeneration will take care of his recoil, as he will inevitably be forced out by something faster.
Even considering something dumb like 252/252 Def Bold kyogre, ho-oh can still 2hko it. LO Brave Bird KO's no-def no-hp kyogre if SR is up, which spells a similar fate for Manaphy and other waters that would try to beat him. Even Garchomp faces a likely KO from Brave Bird with sr+1 layer of spikes, and he has a bit of wiggle room with his EVs, as what's really important is just maxing attack and deciding what you want to outspeed.
Ho-oh @ Life Orb
252 Atk/whatever
Adamant/regen
Sacred Fire
Brave Bird
Substitute
earthquake
Even considering something dumb like 252/252 Def Bold kyogre, ho-oh can still 2hko it. LO Brave Bird KO's no-def no-hp kyogre if SR is up, which spells a similar fate for Manaphy and other waters that would try to beat him. Even Garchomp faces a likely KO from Brave Bird with sr+1 layer of spikes, and he has a bit of wiggle room with his EVs, as what's really important is just maxing attack and deciding what you want to outspeed.
Ho-oh @ Life Orb
252 Atk/whatever
Adamant/regen
Sacred Fire
Brave Bird
Substitute
earthquake