That depends on it's type. If it's fire type then water is more powerful if it's grass then fire is stronger and if it's water then grass is stronger. The list goes on but those are the basics
Legendary dragon weakness is legend dragons
legendary
No you can catch one of the legendary dogs anywhere in kanto, wich one you will find depends on the weakness of your starter pokemon
Dark Pokemon are Psychic Pokemon's weakness.
It is a rare pokemon, but it is not a legendary pokemon
No, it isn't. Level it to 100, give it Wonderguard since Spiritomb doesn't have a supereffective weakness, a Lum Berry just in case of a Darkrai's certain move, use action replay to teach it any TM/HM, and you'll have an invincible legendary looking pokemon that you can use in Wi-Fi Battles.
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.
Noivern is not a Legendary Pokemon.