Wildfire the L18 Combusken and Willow the L17 Bayleef vs. Lento the L16 Slowking and Righello the L16 Tyranitar

Wildfire:
HP: 60
Attack: 46
Defense: 37
Speed: 72
Special Attack: 46
Special Defense: 37

Willow:
HP: 58
Attack: 36
Defense: 84
Speed: 36
Special Attack: 37
Special Defense: 42

Lento:
HP: 66
Attack: 39
Defense: 40
Speed: 24
Special Attack: 47
Special Defense: 50

Righello:
HP: 68
Attack: 57
Defense: 50
Speed: 34
Special Attack: 45
Special Defense: 47

A sandstorm kicks up the moment that Righello is summoned to the field. Wildfire loses 8 damage, Willow loses 7 damage, and Lento loses 8 damage.
Wildfire starts the battle by spewing a Toxic at Righello. Righello is badly poisoned.
Willow also tries a Toxic but the attack misses.
Righello shocks Willow with a Thunder Wave. Willow is now paralyzed. Righello loses 4 damage due to Toxic.
Lento lets loose a Psychic attack that deals 58 of Wildfire's HP and KO's her.

Wildfire: (KO'ed)
HP: 0

Willow: (paralyzed, speed down)
HP: 51
Attack: 36
Defense: 84
Speed: 9
Special Attack: 37
Special Defense: 42

Lento:
HP: 58
Attack: 39
Defense: 40
Speed: 24
Special Attack: 47
Special Defense: 50

Righello: (badly poisoned)
HP: 64
Attack: 57
Defense: 50
Speed: 34
Special Attack: 45
Special Defense: 47

The sandstorm rages, taking 7 damage off of Willow and 8 damage off of Lento. Righello is unaffected.
Righello Bites Willow and chews out 15 damage. Righello loses 9 damage due to poison.
Lento uses Psychic on Willow and blasts out 24 damage.
Willow tries Sunny Day but misses.

Wildfire: (KO'ed)
HP: 0

Willow: (paralyzed, speed down)
HP: 5
Attack: 36
Defense: 84
Speed: 9
Special Attack: 37
Special Defense: 42

Lento:
HP: 50
Attack: 39
Defense: 40
Speed: 24
Special Attack: 47
Special Defense: 50

Righello: (badly poisoned)
HP: 55
Attack: 57
Defense: 50
Speed: 34
Special Attack: 45
Special Defense: 47

Righello uses Bite on Willow and inflicts 17 damage, which is enough to KO her.

Wildfire: (KO'ed)
HP: 0

Willow: (KO'ed)
HP: 0

Lento:
HP: 50
Attack: 39
Defense: 40
Speed: 24
Special Attack: 47
Special Defense: 50

Righello: (badly poisoned)
HP: 55
Attack: 57
Defense: 50
Speed: 34
Special Attack: 45
Special Defense: 47

Lento and Righello win and each grows a level. Congrats.