Slaking: A normal type which is heavy and sleepy.
The perfect match would be Primeape. Primeape has an ability which enables it to stay awake when its foe tries to make it sleep. Since Slaking usually knows Yawn, this is a good advantage. Primeape is also a fighting type which would be super-effective against Slaking. Also, if you teach it Low Kick- which is more effective on heavier pokemon- you have a winning stratedgy against Slaking.
Just make sure it has a high enough level.
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fighting type moves
Slaking.
SLAKING
i think slaking.
Many trainers are stopped short by this powerful pokemon mostly because it can learn many powerful moves of different types so it's really difficult to defeat it. A couple strategies can be used to defeat Mewtwo for starters use a pokemon that has high special defense that is critical for a fight against mewtwo some good pokemon with this in mind are: Blissey, Slaking, Snorlax. Slaking i would say is the best choice because mewtwo's lowest stat is usually defense and Slaking has high attack power have it use Shadow Ball repeatedly or Hyper Beam and Mewtwo should go down easy.