Robinson caught six passes for 107 yards and had a pair of scores, but it wasn't enough as the Trojans overcame a 21-17 deficit late in the fourth quarter with a safety then a field goal to score the final five points.
"It's very tough," Robinson said of his high school career ending. "I just wanted to get a class championship ring for my teammates. I've still got a chance to play football, but other people aren't going to get play more football."
Robinson scored on a highlight-reel, 60-yard touchdown pass in the second quarter to break a scoreless tie.
"Every time I score my first touchdown I get my team up and get them ready to play," he noted. "I just should have kept on scoring."
He scored again in the third quarter to give the Indians a 14-10 advantage.
"I don't know if I've faced a better team with as many play-makers spread out across the field," Muscle Shoals head coach Scott Basden said. "It just seemed like when we had number 5 covered up it looked like he was jumping up there in the lights and catching it. He's a special human being."
Pinson Valley head coach Matt Glover said it's going to be different without Robinson in his program.
"The last three games Earnest stepped it up for us," Glover noted. "It's going to be different looking out and not seeing number 5 out there. It's going to be hard. We'll have some guys step up next year."
Pinson Valley finished the season 8-4, but midway through the regular season the Indians were 2-3 after an overtime loss at Clay-Chalkville.
"We fought pretty hard and we had our minds right just like we did versus Clay," Robinson said of the loss at Muscle Shoals. "We had our ups and downs. I was trying to lead our team all the way to Auburn (home of the Super Six state championships), but sometimes it goes.
"We've come all the way," Robinson added. "As soon as we played Clay we knew that we just had to get our minds right. The other two games didn't matter. We had come off some bumpy roads and come a long way."
Pinson Valley head coach Matt Glover said he saw the progress ,but added that his team never did hit its stride despite the six-game win streak and a near win at the #1 team in 5A.
"We can't be more proud of our kids, but we're still disappointed," Glover said. "We knew we had a chance. We've played good competition. I told them that most people that come in here are beat before they get off the bus--the mystique of Muscle Shoals. We took them to the wire, just ran out of time.
"We never really hit our stride the whole season--offensively, defensively, special teams," he added. "Tonight the offense played good and the defense played good, but the special teams missed a couple of field goals. We practice that every day. They made them, we missed them."