yup
You must have defeated Cyrus at Mt. Coronet and battled Dialga.
If you battled Rayquaza and defeated it, then it's gone. You only get 1 chance to catch a legendary Pokemon.
Technically, you can't "catch" Pokemon because YOU are Pokemon. I don't believe you can. All I do know is that every legendary Pokemon I've battled none could be befriended.
After you beat the game, go back to the places you originally battled them. You don't have to buy their friend area (it comes with them). If you only have one Pokemon on your team, it is very likely that the legendary will want to come on your team!
No, legendary Pokemon only appear once. If you defeated Registeel, then he's gone from the game for good. Hopefully, you saved before you battled him.
nope unless you saved b4 u battled them then u can shut off and battle them again
I got Squirtle and the Pokemon that was roaming around was Raikou. I caught it after he was roaming about for a while I battled him a lot of times. By the way! You don't get legendary dogs in original Red, you get them in Fire Red only.
If this is your first battle with saturn, after you defeat him, head off to Lake Verity to check if everything is ok. If this is your second battle with him, when you battle him and Charon, head off to Mt. Coronet to battle Cyrus.
You have to go through mt. coronet, battling lots of galactic grunts (annoying). After you make it to the spear pillar, battled against mars, Jupiter and Cyrus, at last you can battle dialga. Good Luck!
mewtwo is the best when u have the moves thunderbolt, ice beam, psychic and aura sphere. I have battled hundreds of times against my friends and it has took out all 6 pokemon in 1 hit every time :-)
to get azelf if you've fainted it or ran away you need to beat the Pokemon league
You can't. It would be wise to save before you go into battle with it- then you can turn of and then turn on the game if you do faint it. Suicune is the only legendary beast who can b battled after it faints.