Question

Thir is always a trio for every two main legendaries and laways a third pokemon making it another trio why isnt their one forthose two?

Comments

Im srry pokemon

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And I think there should be a third pokemon between lugia and ho-oh

Answer 1

I think because that Mew and Mewtwo doesn't count as a duo because Mewtwo is a clone from Mew and if you'll see, most of those duo pokemon have the same base total and Mew and Mewtwo has very different base stats.

Comments

Also say Diagla, Palkia and Giratina, they all basicly have the same level-up moves exept for they're "special" move and Diagla's Steel moves, Palkia's Water moves and Giratina's Ghost Moves.