Do you have to train your Pokemon to encounter Reshiram or Zekrom?

Question

I have been wondering for several weeks. Do I have to level them up or do traded ones count. To be honest I already caught Reshiram and can't figure it out.

Comments

Unless you tell me that is

Answer 1

In order to encounter Reahiram/Zekrom, you need to have at least one level 100 on your team for the mirage spot to appear. And it doesn't matter if it's traded or not, as long as it's level 100 and in your party, you should be able to go catch Reshiram/Zekrom.

Source: I've done this myself and it works (I traded over my level 100 Breloom to Alpha Sapphire to get to Zekrom and it worked).