Question

So someone asked where the shadow triad was immediately(I mean right after beating the 7th gym leader Drayden), but I want to know where they are after you beat one of them and they escape.

Answer 1

The Shadow Triad are seen again on the Plasma Frigate after talking to Ghetsis about Kyurem. Each Shadow battles the player after they give Hugh back his sister's Liepard. After defeating them, they allow the player to leave but warn them about Ghetsis and Kyurem, and end up staying behind with Hugh and Liepard.

http://bulbapedia.bulbagarden.net/wiki/Shadow_Triad#In_the_games

Comments

Where is the frigate then? i already looked at this and didn't understand.

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It's at various locations.  Castelia City, Pokemon World Tournament, Opelucid City, Route 21, Giant Chasm, and P2 Laboratory. It moves as you progress through the story.