professor rowan doesnt have a lab in eterna
but oak stays in a house north west of eterna once u finish the national dex
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He will apear in Eterna city in the house right from the gym
He lives in the bottom left most house. After or before Shaymin, he gives you an Upgrade.
when you get anational dex go to pal park he will give you a new app ten go to eterna city and go to his house <-------------this works (when you talk to him he also gives you the up-grade. He says the up-grade evolves a Pokemon when it is traded while holding it the Pokemon is porygon) (you get porygon from a person in veilstone city) go south of enterna city left of the eterna gym. There is a small house and there he is
You get it in route 204 south of eterna city.
You can find the 2nd gym in the south part of Eterna City.