should i save my masterball for zekrom, thunderus, or someone else?

which one

 

There is a lvl 75 legendary (dragon/Ice).

If you want to capture him with duskballs, good luck.

 

Also, they upped the capture rate for the Black/White Dragons so much that they can be caught at yellow health with an ultra ball (after a few attempts and of course a status condition)

Save that Master Ball for Kyurem or for Thunderus, though the latter can also be caught easily if you have mean look, hypnosis and some dusk balls.

 

K ill save it for the Ice/Dragon

 

I used my Master Ball for Zekrom, and caught Thundarus with an Ultra Ball.

 

Save your master ball for Missingno. or whatever its name is in Black/White.

Just to be epic.

 

Save it for Kyurem..... you'll be glad you did (he's a post game legendary dragon/ice and the third dragon)

 

i caught mai victini and zekrom with a critical catch i was when i caught zekrom without attacking

 

I usually use my master ball on runners so I caught all the other legendaries with regular balls.
If you really don't feel bothered to chase the roaming legendary in this game, use it on them. Otherwise use it on Kyurem as its catch rate is pretty low.
And just throwing it out there, that fish pokemon (Basculin?) has a lower catch rate than Reshiram/Zekrom.

 

Don't use it on Zekrom since it doesn't flee and if you kill him he will still be standind and says TRY TO CATCH ME

 

yea right i caught a shiny basculin with a pokeball

 

So?
It has a really low catch rate overall (lower than Zekrom and Reshiram), which is odd.

 

yeah save it for the ice/dragon its worth it