Wild Snorlax
From Poliwager Wiki
The Wild Snorlax is a Pokémon on the site that is always hungry and enjoys eating berries. If you feed him 500 berries that you collected, he will give you a Summon Item as a reward. The page will list how many berries you have currently fed the Wild Snorlax and will reset the number once you feed him 500. You can see how many berries of each type you have.