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.
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You probally want to use it on mewtwo because it is level 70
the best Pokemon to use against electric Pokemon is ground/rock Pokemon.
Ground types are best against electric types.
Mewtwo I guess????
not sure about a complete set but pyscic is definitly a good move to know for mewtwo. in elite four physcic is good for 1st trainer,water2nd,physcic works for3rd,works for 4th also but i use ice,and depending on rivals Pokemon physcic should be good I have a mewtwo level 100 and my favourite moves for it are: Mewtwo: Level 100 Ice beam: 95 power and 100 accuracy Shadow ball: 80 power and 100 accuracy Recover: heals about half its health Psychic: 90 power and 100 accuracy Ice beam is good for defeating grass,dragon,flying and ground Pokemon Shadow ball is good for taking down ghost and psychic Pokemon Recover is excellent for regaining needed helath without potions Psychic is good for fighting fight and posion type Pokemon So overall mewtwo is strong against grass,dragon,flying,ground,ghost,psychic,fight and poison type Pokemon and only weak against bug,dark and ghost. Try this website. It'll help you with other Pokemon too: www.smogon.com/dp/Pokemon/mewtwo