lol dd latios is one of those mons that i always theorymon about but never actually try because these theorymons are always offensive and i am bad at finding offensively-synergetic partners...aka i'm a pussy
have you tried hp fire tr reuniclus? the amount of scizors that thing has killed is unbelievable. shadow ball is useless because i have cb scizor to pursuit lati@s / opposing reu. also, focus blast is the worst move in the game, both on reu and especially gengar. whyyy do they not get aura sphere
another mon you might wanna try is sub SD acrobatics flight gem gliscor, aka the gayest pokemon ever - i've been robbed of SO many wins by its sand veil bullshit and i've robbed nearly the same amount of wins from my opponent. its been the focus of my last 3 teams and it nearly never disappoints