Talk:Master Ball/@comment-71.60.125.183-20140313030322/@comment-24415854-20140531182727

There are some very hard legendaries to catch. There is an end game legendary that knows destynie bond, Volcanion used to know explosion (though that has been patched out as of 1.4.7), Hoopa is a roaming legendary and is glitched so that you will kill it in one move by any pokemon close to a similar level, there are also shadow legendaries which will damage themselfs each turn regardless, and one of these legendaries is also in the same fight of 3 shadow pokemon (gardevoir, dragonite and metagross I think) and so it might be worth using there to improve your chances of catching all of them.

TL:DR I would not waste a masterball on Jirachi or Mewtwo as someone else suggested as they are not particularly hard to catch compared to others, save it for a shadow legendary or the gold cuff sidequest.