In a medium saucepan over medium-high heat, bring 4 cups water to a boil. Add bouillon, stirring until dissolved. Add chicken; cook until cooked-thorough, about 20 minutes; transfer to refrigerator until cold. Shred chicken. In a medium bowl, stir together chicken, mayonnaise, onion, guacamole, garlic and cilantro. Season with adobo. Gently fold in avocado. Refrigerate until ready to use.