Okay Yaotyl, use a Faint Attack to dodge out of the way of that Seismic Toss! Use another Faint Attack to get close, and finally use a Thunder Fang to latch onto Diatribe once more. But if he manages to trap you in a tomb, use a Rock Smash to get out of there, and then use a Payback.
~Faint Attack ~Faint Attack ~Thunder Fang
Subs: ~Faint Attack ~Rock Smash (if trapped in Tomb) ~Payback (if hit by the Tomb)