But really, Cicada, I was simply explaining the origin of R_N's comment on a Shiny Patrat; you're the one who asked. Replying with "Who cares?" to every answer to your questions is quite annoying, I'll say.
tbh mewtwo is inefficient as hell; you want something with very high pp and status immunity to be used. Tackle (even better is Covet; Wing Attack is also good) anything is good, for example. It is pretty lulzy, though.
For anybody interested in ever speedrunning a game, the optimal mon to trade is: