I know that's true, because I caught my Zapdos in X in a Heal Ball after 2 soft resets caused by running out of PokeBalls the first time and accidentally knocking it out with a crit the second time, I had whittled down its health and I sent out my Xerneas, who held leftovers, then had her(I know Xerneas is genderless, I consider mine female) use Geomancy three times and she was able to tank out Zapdos' attacks, then I decided to wing it with a Megahorn or two and got its health pretty low and then I started chucking Ultra Balls until I decided to try a Heal Ball. Got lucky and Zapdos stayed in the Ball, and I found out it had a Jolly nature(helpful for an Electric-type Pokemon, I suppose)Eh, it wasn't your fault Candice spams Double Team with her Froslass during a hail storm. And you actually don't -need- a Master Ball to catch a legendary--it just makes it easier. After all, you (usually) only get one Master Ball per game and there's always more than one legendary. I've caught most of my legendaries in Dusk, Timer, or Ultra Balls. Heck, you can even catch a legendary in a Poke Ball if you get lucky XD
I made too many mistakes growing up.
1. I never beat the original red and blue game I never made it to the elite four. I did beat all the gym leaders and to the cave past the victory road. As a kid it never occurred to me that there was an elite four at the end of the cave.
2. I taught all my pokemon HMs. Why because you can use them as many times as you want. So I did. Charizard learned cut and fly. Enough said.
3. His other two moves were fire blast and overheat. Even if I made it to the elite four there would be no chance of me winning. Charizard was my only lvl 70+ pokemon. (I mostly only used charizard as you can tell) I also used a nidoqueen occasionally.
4. I caught a gravler with a master ball because I wanted to see if it would work. To make matters worse I never used it.
5. Do any of you guys remember the name of the cave you use flash in (red and blue) I didn't use flash. I stumbled around in the dark and somehow I actually managed to make it to the other side. Eventually...
I could list more but I think you get the point...