Revival of The Betrayed

Ash is betrayed and accidentally killed by his friends. Revived as a dark blue Mew, he finds himself happier. However, he decides to compete in a Pokemon Battle Tournament, where his old 'Friends' are competing as well. However he can only be human for a certain amount of time. Will he be safe from Pokemon trainers? What will happen when his old 'Friends' find out? [Dreamshipping]