Why does Stunky learn Explosion?

Question

Stunky learning Memento, I understand to a dark skunk Pokemon, but explosion by a skunk it's pretty strange, so why the move, Explosion?

Comments

gas build up

Answer 1

Stunky can explode either by igniting its gases or by abusing Game Freak logic.

Comments

That makes sense, not so much about the game freak logic though. And I'm guessing that's where the flamethrower comes in right?

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Yes. (Light it up)

Answer 2

I find that lots of Pokemon have moves based on their evolution and forms, and seeing how Stunky evolves before it learns explosion, and evolves into a Pokemon that is literally based off of a tank, explosion is a justified move.

Comments

Well, can't argue with that, however, I do find it odd how most pokemon can learn explosion, not the ball-related types.