How do you get marshtomp in Pokemon Mystery Dungeon?

You can't get Marshtomp in Pokemon Mystery Dungeon, at least not in the mainline games like Red Rescue Team, Blue Rescue Team, Super Mystery Dungeon, etc.

Here's why:

* Marshtomp evolves from Mudkip: Mudkip isn't available as a starter Pokemon in any of the Mystery Dungeon games.

* Evolving in Mystery Dungeon: Evolution in Mystery Dungeon games is often tied to specific story events or requirements, and you can't directly evolve your Pokemon through leveling up.

However, you can still get a similar water-type Pokemon like:

* Squirtle: Available as a starter in Red Rescue Team and Blue Rescue Team.

* Piplup: Available as a starter in Explorers of Time, Explorers of Darkness, and Explorers of Sky.

* Oshawott: Available as a starter in Gates to Infinity.

While not Marshtomp, these Pokemon can still be valuable members of your team!