Question

What can't I find Tyrouge after getting the national pokedex, I have looked at route 112 and the jagged pass?

Answer 1

You must sneak up to them using the DexNav. They're those Pokémon with part of their body sticking out of the grass and you must gently push the Circle Pad to sneak up to them.

Source: http://pokemondb.net/location/hoenn-jagged-pass

Comments

Of course, you need the National Pokédex, but you already have it.