Question

Is it possible to get Poochyena in HG/SS?

Answer 1

Yep. It is a Swarm Pokemon.
It can be caught on Route 1 with a Swarm. Level 2.
http://pokemondb.net/pokebase/18652/what-does-swarm-mean

Comments

Thanks!

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hoenn sound too, right?

Answer 2

A Poochyena can be obtainable
-By Trading a Mightyena and Breeding via the GTS or a Local Trade.
-Trading one through the GTS or locally
-Transfering one from Emerald to DPP via Pal Park and trading it to HH/SS

Comments

Right. Or you can do it the way you can get any Pokemon. XD