If it is a wild Pokémon, no, it will always catch it; the only instance in which it could fail is if you threw it at another Trainer's Pokémon (besides Shadow Pokémon).
By using a Master Ball.
Yes. When you are trying to catch the Misingo Glitch Pokemon. But master ball won't fail on any normal game Pokemon.
Theoritically, in how master balls work, there is a 1 in 65000 chance that a master ball will fail due to how the game is coded. So yes, a master ball CAN fail :D
You use a master ball
Of course, a Master Ball catches any Pokemon without fail, Legendary or not.
This is impossible without the use of cheat codes, unfortunately. Only the Master Ball can catch Pokemon without fail.
You can catch Pokemon without fail if you use a Master Ball. A Master Ball has a 100% catch rate and is recognised by the "M" on the top half of the master ball. Some people say if you throw a normal pokeball an holding L, R and Select it will have around the same catch rate as a master ball though I tried it and it doesn't work.
You are going to have to catch him! How you can catch him easily is use a Master Ball. It can catch him without fail (just as the definition says!)
The only way to catch a Pokemon without fail is to use a Master Ball. In most games you will obtain one Master Ball over the course of the story, but there are other more difficult ways of getting Master Balls. One such way is the lottery.
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.
yes it does because a master ball catches pokemon without fail
no