Typically, there is more than one Legendary Pokemon per game that you will want to catch. The easiest method is a Master Ball, but you only get one. So what do you do? Well, if you're good at math, there's an equation that lets you figure out whether or not using a Pokeball of some sort will catch the Pokemon.
a = {[(3Hm-2Hc)RBb]/3Hm}Bs This looks really complicated, but all it is is this: Take it's max HP, Hm [you'll have to estimate this, most likely], and multiply it by three. Multiply its current HP, Hc, by two, and subtract that from the first number. Multiply this new number by its catch rate and the ball bonus [look this up on serebii.net or bulbapedia.bulbagarden.net]. Divide everything by the max HP, multiplied by 3. Then, multiply this last number by the status bonus. The status bonuses are 2 for frozen and sleep, and 1.5 for paralyze, poison, and burn. If the number you get is 255 or greater, then the Pokemon will be caught.
For those who don't like math, go catch a Gastly at the lowest level you can. Go and fight Pikachus, Weedles, Pidgeys, Rattatas, Spearows, Golbats, or Zubats with it until it hits a decent level, and feed it Carboses. What you're doing here is called EV training. Basically, it will max out your Speed stat. This is essential for most Legendaries; they're not classified as Ubers for nothing. They will almost certainly have higher speed than you and run away before you can throw a ball. What you do with this superfast Gastly/Haunter/Gengar [because you can, of course, evolve it] is teach it Mean Look, Hypnosis, and two attacks. Make sure one is something very weak [so you can chip away at low HP] and one is moderate [so you don't accidentally wipe out the HP with one Super Effective hit]. You'll want to go into the fight with this Pokemon and instantly use Mean Look or Hypnosis, depending on what Pokemon you're going after. If you know it knows Whirlwind or Roar, you're better off using Hypnosis. There's a chance it won't work, but Mean Look doesn't affect either move at all. Then you'll want to start whacking away at HP. You want to get it down to a sliver of HP or, at the very least, in the red zone. Keep using Hypnosis to keep it asleep, as this will help you catch the Pokemon. Once it's down in the red, start chucking Ultra Balls at it. You'll want to take at least 30, just in case. Make sure you keep it asleep, and keep flinging Ultra Balls, and soon you'll have your very own Legendary Pokemon.
you want to get it as close to 1 hp as possible. and putting it to sleep is ideal too. (try a jigglypuff. they can learn both false swipe AND sing which puts them to sleep) After 30 trys of balls, use timer balls. Because they are twice as affective than Ultra balls after 30 turns. Which is kinda close to a master balls limit. However, for ones like Cresselia and Mesprit and others like that, well, i only have diamond and i used a heal ball for mewprit and pokeball for Cresselia. (no idea how it caught)
Yes, i caught him with a master ball but one of friends caught him with a dusk ball and one caught him with a timer ball. So try those.
yes, but you need to save the game before you go to rayquaza you might lose or kill rayquaza ps: you better have a lot of ultra balls
YES THERE IS!!!! WITH A MASTER BALL!!!! (or the ball below that one) (in a list)
Simple - use a different Pokéball! I've heard Zekrom is easy to catch, anyway.
yes you can catch it with anything
Yup.
the masterball is for any Pokemon you want, it can catch them without fail ( it will ALLWAYS work ) . you are supposed to use it for mewtwo though. :P
Use you masterball on suicune because its impossible to catch it without a masterball it would just flee i cuaght mewtwo with a great ball but make sure you have lots of them.
The best way would be to catch Mewtwo with a MasterBall. However, you can also catch it with Ultra Balls, but that will cost you a lot of them. Mewtwo is a psychic pokémon, so it's weak (2x) against bug, dark and ghost types. It's highly recommended to breed a Rattata so it learns the move Endeavor. After Mewtwo has 1 hp left, due to this attack you can put it to sleep, freeze it or paralyze it.
well, i have no clue how o catch mew but to catch mewtwo in leafgreen or firered all u have to do is have the national dex and beat he elite four (which is the funnest part in the game mewtwo is a HUGE powerhouse) just go to the cave in cerulean city and go through the cave and catch him.
yes it is possible but very very hard First of all you need to save before you start so that you can try again when you mess up. Then get about over 30 ultra balls and get it to the point where the mewtwo is almost fainted. Make sure the pokemon is not dizzy or poisoned. Just keep throwing ultra balls at the mewtwo and make sure YOUR pokemon is strong too. It is better if you make the pokemon sleep.
With a Masterball
MasterBall
Try to catch it with a masterball. that's what i did.
masterball
you have to save your masterball no matter what and use it on mewtwo in order to catch it faster. otherwise, you are going to spend hours trying to catch it without any luck.
masterball
It isn't meant for any one pokemon. Most people use it on Mewtwo, which you probably should use it on. You can catch the legendary birds and Mewtwo without a Masterball but it can take a long time.
the masterball is for any Pokemon you want, it can catch them without fail ( it will ALLWAYS work ) . you are supposed to use it for mewtwo though. :P
the strongest pokeball is the masterball. the masterball can catch any Pokemon out of the 493. it doesnt matter what kind of Pokemon it is, the masterball can catch any Pokemon.
Use you masterball on suicune because its impossible to catch it without a masterball it would just flee i cuaght mewtwo with a great ball but make sure you have lots of them.
dont use ur masterball on anything but mewtwo, sleep it- then final cutter(i forget)( the one that leaves 1hp) and timerball- or ultraball it away try to get a modest or timid nature one --- if you are interested in ev training
Yeah it is possible to catch kyogre with out wasting your masterball you wont have to use it until you see latias and latias requires you to use your masterball.