Oh man, I remember hyping up the first movie SO much to my dad just so he'd come with me to watch it, of course he'd typically fall asleep while watching any movie at the cinema and this one was no different. XD; But I remember it being one of the few movies that actually managed to make me cry, I'm sure you can guess which scene in it actually jerked the tears, it gets me every time.
I have Mewtwo Returns on VHS, but it's misplaced. <_< May just grab another copy if I can't find it, but I remember being very fond of it as well.