Mr.Mime

Mr.Mime.The ultimate creeper. The messed up clown creature. The disturbed Mr.Mime is one of the most infamous pokemon in existence.Even though I don't have a taste for Psychic types as much as I used to when I was about 9, I know enough to recognize a good one. Though Gallade, Gardevoir, Metagross, and Alakazam are the most popular and honestly the best Psychic types there are, but this thing would be in that list too if it wasn't almost as creepy as Hypno. Thanks to its pretty good special attack and mediocre speed, it can fight off annoyances like Sawk and Machamp, which are now the most reoccurring Fighting types I can find.
Moveset: Reflect/Barrier/Magical Leaf, Baton Pass, Psychic, Healing Wish/ Future Sight/Fake Out
     If you aren't one for strategy, I wouldn't bother with Mr. Mime, or honestly any Psychic types. If you aren't one for breeding, find a mediocre move to replace the Healing Wish/ Future Sight/Fake Out moves. Here, Mr. Mime is indestructible. Reflect boosts his low defense, as does Barrier, while Baton Pass in the, "in case of inevitable destruction, break glass" kind of thing, passing on stat boosters you placed on him to your Bastiodon(psh, screw giving the boost to someone who needs it). Psychic should honestly be your Mr. MIme's only attack, and if you encounter Dark types often, maybe you'd rather have Magical Leaf instead of a stat booster. That's the shining jewel of Mr. Mime. He has an enormous movepool. You can make him offensive, defensive, or just plain irritating. I may not be a fan of Psychic types, but for those of you who are, this Pokemon is a fantastic choice of partner.
Counters: Sablye, Zoroark, Gengar
     Sablye is entirely perfect against Psychic types, and Mr.Mime is no exception. Zoroark is way too fast for Mr.Mime too stop, and Gengar's acess to status inflictors heavily threaten Mr.Mime to switch out.