Depends on your style and body type.
But i'd keep myself lean and mean during training, with Chicken breast, vegetables, well rinsed and cooked rice for flexibility, Fruits for snacks, and a small cup of oatmeal after each meal. Which i eat the same meal every 3 hours and up to 5 meals per day, but in smaller portions each time.
Besides this, poked garlic pieces in a glass of water twice a week for good blood flow.
A spoon of peanut butter on a rice cake before everyworkout to trick your body to burn away access reserve fat in the body, as more are deceptively coming in from the peanut butter.
On the day before the fight, high fat and good protein for extra energy and a little beer for good adrinaline.
note: don't forget that for salt, don't use regular salt, use Iodized sea salt for your meals in your diet.
Petagree
Kibble and bits or Science diet works well. If he's trying to go up in weight hell you could feed him Fancy feast.
BEER