Cassius (Lv. 16 Male Ninetales) vs Willow (Lv. 19 Male Bayleef)

Cassius's Stats:
HP: 59
Attack: 39
Defense: 39
Speed: 47
Special Attack: 41
Special Defense: 47

Willow's Stats:
HP: 63
Attack: 40
Defense: 94
Speed: 39
Special Attack: 40
Special Defense: 47

Cassius uses Heat Wave, dealing 45 damage
Willow uses Headbutt, dealing 12 damage

Cassius: 47 HP
Willow: 18 HP

Cassius uses Heat Wave and deals 39 damage, which is enough to knock Willow out

Cassius: 47 HP
Willow: 0 HP

Cassius wins the battle and grows to Level 17