Mew really wasn't biased against clones.All it did was simply throw Mewtwo's words into his face. It's words switched the roles so it could egg Mewtwo on in a fight.
English Dub Mew is a Badass PacifistUnlike the japan Mew, who was taunting Mewtwo.
Mewtwo should not have wiped out the trainers' and the pokemons' memories of what happened on New Island.
Ash never died in the movie.Ok, so Mew and Mewtwo are fighting against each other after the other pokémon all slow down and stop. They match each other so well, however, they use more unusual moves. Maybe they were even mixing the moves up and using moves that didn't even exist at the time - they're legendaries, they don't have to follow the rules! Anyway, Ash decides to intercept when the Psychics are charging an unidentified move and are just firing it at each other. Maybe they're both using Hidden Power (Rock) with a good old chunk of Psychic, for good measure? Ash gets in the way and hit full-on. Ouch. He kinda hovers there for a few seconds before sloooowly falling down and going "Urgh" quietly. This could be him just losing consciousness and/or going into shock. By the time Pikachu reaches him, his whole body hardens into stone, which wouldn't make any sense if it were just a psychic type move - hence my theory that it's Hidden Power. But wait, there's more to it!! Obviously Pikachu trying to shock Ash back to life isn't going to work if he's been petrified (maybe there was some Hidden Power (Ground), too?) so how can Pokémon tears magically revive him? With all the psychic energy that blasted Ash, he became a magnet for the pokémon tears, which allowed them to fly across the room to fall on him. This gradually corroded the stone (maybe pokémon tears are super acidic, too?) and makes Ash glow blue, and then he's revived! Hooray!! Naturally, there are a few holes in this theory, but in the Pokémon world, it makes more sense for something like that to happen without being fatal (they survive lots of otherwise hugely damaging things, like being burned and falling off cliffs, after all) than to have a character die and be brought back to life without even trying CPR.
This movie is the reason why Ash is still 10When ash was revived from the Pokemon tears he may have also gotten eternal youth and life ala Jack Harkness.
Mew resurrected Ash through the other Pokemons' tearsWe've already seen Pokemon who have the power to bring others back to life (Ho-Oh), so it's not unreasonable to believe one of the original and most powerful legendaries, and the father (mother?) of all Pokemon, would have this power too. Just bringing Ash back to life might have been too obvious, so by working through the other Pokemon it was able to resurrect Ash and also drive home the point that senseless fighting is wrong to Mewtwo.