I'm not sure about the best, I'd say that is a personal preference. But I'd say the most powerful ones are the legendary Zapdos, Moltres and Articuno. But you can have others like Blastoise, Charizard, Venasaur the 3 starters. Then Alakazam, Gengar, Snorlax, Arcanine, Magmar, Machamp, Hitmonchan, Hitmonlee, Dragonite, Aerodactyle, can basically be some of the most powerful.
Hope that helps a little.
mewtwo
THE yellow pokemon :) lol
Yes
Yellow. Definitely Yellow. That's a hard question to answer but it is definitely out of Pokemon black and Pokemon white.
pokemon blue
mr.g
eating
pokkemon yellow
At the Pokemon league.
problably jolteon
Mewtwo is the best Pokemon in R/B/Y. No other Pokemon comes close.
elite four again and again.worked for me