haha well. you realize Kel is a very decent player, but he does not play mewtwo, which completely explains his wavedashes. He mains other upper tier characters and has loads of other matches uploaded. only one mewtwo match.
and if you look at the peach, shes no noob at all.
this is a classic and perfect example to how mewtwo started out a match with the advantage "surprise element" the peach had no clue how to do against mewtwo.
watching peach's playing style, the moves were quite suitable against other characters, however it just doesnt work against mewtwo. But seeing as the match developed. the peach at the end of the match played DRASTICLY different from how she started. she adapted, and hence, mewtwo started loosing.
the mewtwo was sketchy in and out, but kel did a great job playing mewtwo in a proper style.
i could go into the details of what the peach changed, but thats just alot of work.