Sumo, Bee, good work. Now let's keep it up.

Sumo, start with Belly Drum to max out your attack power, and then slam Vicki with a Dynamicpunch, then a Fire Punch.

Bee, listen carefully - get in front of Sumo Bro, and use these moves:

-If Vicki and Ralts both try Super-effective attacks, or either of them try a status-inducer, Protect yourself and your partner.
-If just one of them uses a Super-Effective, Endure it.
-If neither of them use a Super Effective attack or a status-inducer, then just blast that Ralts with a Shadow Ball.

Then, for your second move, use Silver Wind on Ralts, and finish the round off with a Leech Life on Ralts.

If either of them use Psychic for their second or third action, Bee, then use Spite instead.

Moves (Sumo): Belly Drum, Dynamicpunch (ATK Vicki), Fire Punch (ATK Vicki)

Moves (Subs): Protect (against status effects or two super-effective attacks) , Silver Wind (ATK Ralts), Leech Life (ATK Ralts)
Subs (Bee): Endure (against one super-effective attack)/Shadow Ball (against no super-effective attacks; ATK Ralts), Spite (on Psychic), Spite (on Psychic)