Ponyta and Rapidash:
For the Galarian Forms this would go pretty well. They’d basically be normal Fluffies. But pretty and fluffier. Maybe this would result in narcissistic Fluffies because they’re too pretty. But for the original Ponyta and Rapidash?
The Fluffy is on fire. The Fluffy is not resistant to fire. This goes about as well as you would expect.
Keldeo:
Tries to fight everything no matter the consequences. Stabs ankles with it’s “sword” (unicorn horn). Probably has a short life span because it has a 90% chance to pick a fight it can’t win.
Mudsdale:
Water is bad for Fluffies so imagine what would happen if a Fluffy Mudsdale, a Ground Type which is super weak to water gets hit by water. I think it’d just melt.
Glastrier and Spectrier:
Noble steeds that are significantly less noble. Glastrier already has built in Smarty Syndrome if you read it’s Pokédex entry (belligerent and takes things by force) but I imagine it would be a lot colder and a lot more violent about it. Instead of “Dis is Smawty Wand nao!” it would just wordlessly stomp the other Fluffy’s head in with its icy hooves. The scientists designing it used Fuzzy DNA to get it’s white fluff and cold blooded killer attributes. Spectrier would be similarly sociopathic but instead it’s methods involve kicking the souls out of other Fluffies and draining their life force. Also, as a quirk they’d call their owners “King/ Qween” as a leftover from being Calyrex’s steeds in canon
