you can't.:(
but you can trade it from firered or leafgreen but to do that you have to get the national dex by catching 60 pokemon and getting all the items the aide has for you.if you own firered or leafgreen just go to Google andtype in how to get MEWTWO.
hope this helps:)
mewtow zapdos moltres articuno mew entei raikou suicune
you must used this cheats at gameshark THE CODE IS : mewtow 30621E6F164FED85
just beat red then go to cerulean city then go to the cave
Mew,MewTwo,Latios,Latias,Raquaza,ect.
mew and mewtow
The strongest pokemon and the powerfull is MEWTOW . you might say Arceus he created the world of pokemon , but he dident create MEWTOW , mewtow created by human , here , the difference between the tow , there is a challenge between these tow . And abuot the new pokemon kyrum his power level of like lugia and others they not on level mewtow and arceus . in my opinion it must become a challenge between these tow to decide who is the strongest in the world of pokemon .
you don't get mewtow in ruby
Go to Cerulean Cave.
The correct spelling for the Pokemon is Mewtwo.
Well,the masterball should be used on what pokemon you think it is your favorite but the best choise for the masterball catch is the mighty lvl 70 MewTow how is a pain in the hole to catch with other pokeballs,but that is your choise
12$ maybe...
in cerulein cave very back