I have to watch my friends Fennekin for two weeks but she does not seem to like my Vulpix. They hiss at each other, steal each others toys and so much of my stuff has been set on fire. Like so much. It’s only for two weeks but is there something I can do to stop them?

It’s possible to separate them as soon as fights break out. As in, physically separate them and tell them in a firm voice to stop fighting. This may seem like a basic thing, but if you show both your friend’s fennekin and your vulpix that you’re neither afraid of them nor afraid of breaking them up and giving them a stern talking-to, then they’ll be more likely to listen to you and behave (in your presence, at least).

It’s also worth it to note that vulpix and fennekin are both fox-like fire-types that evolve into pokémon with mystical abilities and that fennekin, as starter pokémon, are known for being more docile and friendly than the considerably rarer, prouder, more capricious vulpix. That is to say, it’s important to recognize that your vulpix may feel threatened by your friend’s fennekin, so it’s important to give your vulpix its own space and amount of affection. Reassure her that you don’t plan on adding your friend’s fennekin to your team and that she doesn’t have to interact with that fennekin if she doesn’t want to—but that you need her to be on her best behavior if she does.

As for your friend’s fennekin, they’re likely suffering from a simple case of homesickness, which happens when a pokémon isn’t in the care of the human they’ve bonded with. Because of that homesickness, though, your friend’s fennekin may be feeling on edge, which isn’t helped by the animosity your vulpix is feeling due to the aforementioned worry about being replaced. So it’s important to reassure fennekin that your home is its home for the time being and that you’re willing to do whatever it takes to make it feel safe and comfortable. You can do this by giving this fennekin its own space and amount of affection while keeping it away from your vulpix.

If you’re still struggling to keep their tempers in check, it may be a good idea to ensure your vulpix remains in a separate room from your friend’s fennekin. Use their poké balls if you need to, and set up a time when your friend’s fennekin is out and taken care of while your vulpix is in her ball and vice-versa. Be sure to keep their toys and possessions separate and out of reach during each shift.

I know this sounds as if I’m saying it’s impossible to get them to socialize. It’s not. In fact, after rotating them in this manner, it’s possible that they’ll understand why they’re being rotated and attempt to make amends with one another. However, the main point is this is more of an issue you should work out with your friend present, rather than with them absent, as it will involve training on their part as well. You will need to work with your friend—the fennekin’s true trainer, with whom it’s bonded—to bridge the gap between your vulpix and their fennekin and to get the hostility between them to calm. You can only do so much via training your vulpix.

Best of luck in the meantime.