He is in Mr. Mortar (north Johto). Go in and surf, go up the waterfall, and find your way through the cave.
Make sure you have an empty spot in your party because when you defeat him, he will give you Tyrogue.
How to change your username How to add a user avatar Why was my post hidden? Question etiquette Flags vs Downvotes Anime FAQ Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.