In the Pokedex entry for Gen IV to V, it says,
It grows by feeding on gases released by garbage. Though very rare, triplets have been found.
Is it possible to ecounter a triplet Weezing?
No, there is no possibility of getting one. However, there is that third section of Weezing. This can possibly mean that that part sometimes becomes another face/body, and can possibly allude to an evolution in a later Generation like Gen 6.
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