That depends on the game and what is available.
Red, Blue, and Yellow version: Mewtwo and Zapdos are considered the best.
Gold, Silver, and Crystal: Lugia and Raikou are considered the best.
Ruby, Sapphire, and Emerald: Rayquaza and Groudon are considered the best.
Pearl, Diamond, and Platinum: Darkrai and Giratina are considered the best.
legendary Pokemon and starters fully evolved are good choices
Most legendary Pokemon aren't all that good. If you have strong Pokemon which has type-advantage, you shouldn't have any trouble at all.
Yes, Giratina is a good Pokemon. It is one of the legendary Pokemon in Pokemon Diamond, Pearl, Platinum and Explorers of Sky.
It is a rare pokemon, but it is not a legendary pokemon
well that depends if your looking for the best legendary Pokemon. best Legendary: Groudon is a really good Pokemon when it learns fichse. but id have to say groudon is the best
No, even though you can get him only once, he is not legendary. But his evolution, Lucario is pretty good.
Unknown is not a legendary Pokemon but it is considered rare. Legendary Pokemon are one of a kinds.
no lileep is not a legendary pokemon but it is an ancient pokemon
The legendary is palkia
No, snover is not a Legendary Pokemon
No, Blastoise is not a legendary pokemon.
Is sawk a legendary pokemon??