Okay Venus, we're getting him good, and the stewardess hasn't even served drinks yet!

Listen, Reflect will stop his Physical attacks, so lets tone down his Special attacks. Start by using Calm Mind.

Then use Psychic again!

Finally, try to lower his Special Defense and injure him at the same time with Shadow Ball!

If he tries to use Toxic, Thunder Wave, or another move that inflicts a condition, replace your current move with Protect, and hope for the best.

Moves: Calm Mind/Psychic/Shadow Ball (any switch to Protect if necessary)