Where Is Professor Oak's House?

Are you serious? When you leave your house, there is a house on the right (that's gary's house and his sister is there and she'll give you a town map) once at that house go down till you see a bigger house and that's where you'll find Professor Oak

Go to eterna and the house on the bottom after you get the national dex and visit him in pal park and he tells  you about zapdos moltres and articuno