MysticSniper
Spirit of a Dragon
Towns Folk
This is just something I though up, but I don't ever plan to run myself.
Eevee @ evolite
Bold
Adaptability
252 hp & def, 4 sp. Def
Sand attack, wish, heal bell, swift
First, you'll need someone that can learn mean look and baton pass, and crobat comes to my mind. Send crobat out first, and use mean look. If you think you have time for it, use calm mind, agility, or tailwind next (assuming whatever you decide on can learn those). If not, or on the next turn, baton pass into eevee. Start spamming sand attack, and just watch as your opponent's fury builds until they rage quit. Of course, there are a few counters to this: never use on ghost types because you'll never actually be able to hurt them. Also, any flying type, along with any ability that preserves accuracy, will prevent this strategy from working. And let's not forget lucario, who more than likely will know aura sphere, which imediately kills any eevee.
Eevee @ evolite
Bold
Adaptability
252 hp & def, 4 sp. Def
Sand attack, wish, heal bell, swift
First, you'll need someone that can learn mean look and baton pass, and crobat comes to my mind. Send crobat out first, and use mean look. If you think you have time for it, use calm mind, agility, or tailwind next (assuming whatever you decide on can learn those). If not, or on the next turn, baton pass into eevee. Start spamming sand attack, and just watch as your opponent's fury builds until they rage quit. Of course, there are a few counters to this: never use on ghost types because you'll never actually be able to hurt them. Also, any flying type, along with any ability that preserves accuracy, will prevent this strategy from working. And let's not forget lucario, who more than likely will know aura sphere, which imediately kills any eevee.