The problem is in AS(I have its rom decrypted with Pk3DS), I have the cheat "any pokemon can mega evolve" on but I found it unable to mega evolve two or more pokemon, for example, when a Mega Sceptile(with muscle band, which I made it able to mega evolve the Pokemon) switched with Altaria(with pixie plate, which I made it able to mega evolve the Pokemon), I found I couldn't mega evolve Altaria,
Is it the problem of the cheat or my decryption?