There are really no glitches in the game where this can happen. However, if you use a master (which every one knows so i won't belittle myself) it will work.
If you use an external game hacking source like a GameShark (for gameboy sp or color) or an action replay (for a ds), there are codes you can put into the system in the action replay or gameshark so that you can do special things.
But you'd have to Google "Action Replay for Pokemon Emerald" or something like that.
This cheats in the system may include:
-catch with no fail
-walk through walls
-unlimited health
-unlimited master balls
-unlimited rare candy
etc. etc. etc.
there ya go, have fun cheating in the game fellow Pokemon player :)
Of course, a Master Ball catches any Pokemon without fail, Legendary or not.
In battle, teleport will allow you to escape from wild encounters without fail (with the exeption of pokemon with the abilities shadow tag, or arena trap). Outside of battle, it will take you to the last pokemon center you have visited. This is the same for all other pokemon games.
You should use a "Timeball". Go in the battle, and fight 20 minutes, then you should catch without failing.
Go up to the Dotted Hole door on Six Island and have a Pokemon use Cut the door will open without fail but save after entering
I'm not really sure about this. Maybe you can use GameShark. It's the best recommended game hacker. I have NO idea how to use it, so here's an example. It might be the wrong way though. Let's say you have GameShark. Your playing Pokemon Platinum and you're confronting a lvl 100 Giratina. You go and get ur GameShark and use it on your DS. Then, as you use it, you program it to make normal Pokeballs never fail at catching Pokemon. People also talk about catching a Mewtwo in a normal Pokeball. I know a different Pokeball that you probably know about, the Masterball. Only one per game. There's a hack to get multiple groups of 99 Masterballs in ur bag, but I don't know it. It's for GameShark, so you can search on the web. Hope you figure out all this confusing information!
Use the Master Ball if you need to catch a Pokemon without fail. I'd suggest using it on a legendary, though - don't waste it on a common Pokemon.
No both in the games and in the show a masterball can catch any Pokemon without fail. It can fail but it is a 1 out of 65536 chance of failing to catch a Pokémon; this event being 8 times less likely than finding a shiny Pokémon in the wild. Plus it also depends on the catch rate. If there was a Pokemon with a lower catch rate than 3, it could fail.
that's impossible you actually cant
Well i caught mewtwo on full health doing this but... i used a great ball and repeatedly tapped a and it worked
one of his trick has fail
This is impossible without the use of cheat codes, unfortunately. Only the Master Ball can catch Pokemon without fail.
it catches any Pokemon without fail But basicaaly there for ho-oh and lugia
There isn't a way to do it. You can just try to weaken the pokémon and put it to sleep.
Pokemon the game is awesome the show is a fail
shoot him.
Zapdos will be at the Power Plant. Make sure to save before battling it to ensure success and not a FAIL at catching it. This is a freaking legendary Pokemon you won't be seeing again in the game, so catch it, don't KILL IT!
I would recommend using a Quick Ball on the first turn, it has a likely chance of catching a Pokemon, but it won't always guarantee it. Master Balls also can catch a Pokemon without fail, but they are meant to be used sparingly and wisely, primarily on a roaming legendary or a difficult Pokemon with a much higher level. Aside from the Master Ball, every Pokeball has a chance of failing, so there's really not much of a way to catch every Pokemon 100%.