Got to level 22 and still am an adult. Restarted the game, fast traveled to all unlocked grottos and nothing. It happened to my friend, too.
You don't need to defeat Pete to become an elder, you can max out the shark to Mega before fighting Pete...To become an elder you need to defeat pete to
Actually, to grow from adult to elder, you need to confront Pete the second time (not the final fight; this is like 66% into the main story). Once this confrontation is done, you can grow up to mega.You don't need to defeat Pete to become an elder, you can max out the shark to Mega before fighting Pete...