Well today i defeated those 2 with ease. My team was
Haxorus- outrage earthquake rock slide x scissor.
Magmortar- dark pulse blast burn thunderbolt infernal rage
Latios- psychic ice beam tesseract dragon pulse
Venusaur-petal dance razor leaf solarbeam earthquake
Staraptor- brave bird fly close combat custom move(dark)
Mewtwo(strange machine so psy/dark)- dark matter psystrike aura sphere thunderbolt
All of them were 120.