mewtwo, definitely. especially in rby, where mewtwo even has a better movepool than mew (mewtwo gets amnesia, thus basically beating almost everybody - excluding various specialized sets like tobybro and sporing parasect). i don't base my favs on who i would think would win in battle (out of my favs, only eggy and starmie are good, and articuno's pretty good too. but the rest are unstandard for good reason)
DDR: want to pass Paranoia Survivor ~ Religions are just cults with more members. -- The resident SSB:M Captain Falcon user. -- "Let's eat fast so we can eat again!" ~ Ash