inspired by the success of flareon/leafeon, i've been experimenting with leafeon splashing and after a few half-baked decks that didn't get anywhere i happened to find a combo that works pretty damn well. rampardos/sylveon normally isn't a great combo because it's entirely reliant on getting rampardos out quick or you automatically lose, but adding leafeon into it solves a lot of problems without really creating any. since it runs on eevees like sylveon does, it's a consistent secondary attacker that doesn't come with the cost of cucking the sylveon draw engine by starting you with the wrong basic. it also essentially retreats for free so if you get a turn 3 rampardos you can actually swing with it which is always hilarious.
still fiddling with it so the deck list isn't perfect but try it out if you've got the cards, it's pretty fun.