Can I catch Tympole with DexNav without obtaining the National Pokedex?

Question

I want to use Tympole early game.

Comments

Olli is right, but "Kyogre"?

Answer 1

You can catch tympole on route 102. It appears as a hidden Pokemon after you defeat Groudon/Kyogre. Which like what Olli said, is when you get the National Dex.
In short: no.

Source: Pokemon Omega Ruby and Pokemon Alpha Sapphire: The official National Pokedex