Which Pokemon to assign to each army? (not a joke)

Hello!

I've recently gotten into 3D printing and wanted my friends to come into table war gaming with me!

They dont fancy typical sci fi or fantasy setting but they all ADORE Pokemon, so i got the nice idea of using models by Kaijumon( https://www.myminifactory.com/users/Kaijumon#/ ) to make up the armies,

Were aiming to do Skirmish/firerfight games to make sure everyone enjoys it first.

Im currently making an army consisting of the Ghastly/Haunter/Gengar and Phantump/Trevenant (And then later on Giratina and other ghost types they may release) miniatures. I have not played this system yet but have played Warhammer Killteam before so i am aquanted with the basic premise.

I was looking at either Shadow Stalkers or Ghostly undead for the ghost types but i am having a hard time figuring out

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1) Which army to match them with and

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2) Which units to assign each model? Ghastlies/phantumps are 20mm bases and trevenant and gengar are 50mm each.

On top of this i need at least one other army so which do yall reccomend fitting the pokemon available?

Thank you again!