Well, there it is:
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There's no TM for it in-game yet, but I wasn't paying attention to which level exactly she learns it at.
I guess the "modified move set" for waifumons also includes modified learning levels.
I'm also guessing the IVs of waifumons are buffed. Or is it just their base stats?
SINtax EroRR : if I may recommend something relevant to this post; the waifumons could get preset Natures and Characteristics, since they have actual personalities of their own. I'm not sure if Pokémon Essentials even allows to hard-code them instead of randomizing. If you're particularly brave, maybe you could even code your own Natures/Characteristics that would fit each of them in order to make them even more unique...?
And I'm totally not saying this because I'm an autist that savescummed for like an hour to get an Adamant Lopunny and Modest Gardevoir or anything
EDIT:
I have found out that Pokémon Essentials
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to whichever one you please from the base ones. The same page also lets you set their IVs -logically we can assume that's how you set their Characteristics as well.
No info on making your own though, probably hard-coded to only include the base game ones.
Also, big whoop for me: Pokémon Essentials was made for RPGMaker XP instead of RPGMaker VX Ace like I mistakenly thought for years. I definitely couldn't tell the games made on it run on an engine from 2005....