Encinitas, which still qualified for Friday’s semifinals, led 3-2 going into the fourth inning, but Mountain Ridge scored four runs to take the lead for good.
Encinitas wrapped up pool play with a 2-2 record, while Mountain Ridge finished 4-0.
The all-star team from the Honolulu Little League also completed pool play with a 4-0 record, including a 9-2 victory over Encinitas on Saturday.
The first of Friday’s two semifinals will match the second- and third- place teams from pool play and the second will be between the first- and fourth- place teams.
The semifinal winners will play for the championship on Saturday, with the winner advancing to the Little League World Series, which is played in South Williamsport, Pennsylvania.