Question

I notice that every Pokemon type has their lengendary except Bug and Poison type. Why? are they too weak or some reason?

Answer 1

That is becuase they just didn't and until B/W there wasn't a fighting type

Comments

Hmm, yeah but anyway I still want they to release bug or poisin legendary Pokemon in the next Pokemon version :)

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In Gen 5, there is a Bug legendary.
http://pokemondb.net/pokedex/649

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Oh yes you are right then :) I missed it sorry :p, thanks for remind me. Anyway what about Poison legendary(maybe in Generation 6)

Answer 2

well actually there is both.

genesect is a part bug type

arceus can be any type with the right plate, including bug and poison