Ok thanks. I'll make my moves now.
Tortition, use flame thrower, followed by a Lava plume at treeko. If they use a move that would put you to sleep, use protect instead, and if treeko has fainted and you still have a move left, use relax instead.
Eevee, use sleep talk three times.
Tortition:flame thrower~lava plume sub:protect/relax
Eevee: Sleep talk~sleep talk~sleep talk