Question

What is the logic behind Pumpkaboo and Gourgeist being able to learn fire type moves such as Flamethrower? I get the move Will-o-Wisp, since they're part ghost types. But what about learning Flamethrower, Fire Blast, and Flame Charge? They're also part grass type?

Answer 1

Gourgeist may be based on a Jack-O-Lantern with the upper part of its body representing the candles in Them. And as Candles being lit with Fire, Gourgeist may be able to expel that Fire.
Source: https://m.bulbapedia.bulbagarden.net/wiki/Gourgeist_(Pokémon)

Answer 2

Pumpkaboo and Gourgeist are partially based on Jack-o-lanterns. How do you light up a Jack-o-lantern? With fire. It's likely that Pumpkaboo and Gourgeist simply harness some of this fire to use against opponents.

Hope I helped!

Comments

Reeeeeeeeeeeeeeee....Sniped.  XD

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Sorry about that.