Gonna be giving you a Magnemite, Sushi.
Take Analytic the Magnemite. This particular Magnemite believes that it has Analytic, even though this is currently impossible due to the different Generations. Anyways, since Analytic makes your moves stronger if it moves second, it can't use any moves that will make the opponent slower, since the opponent would then be slower then Analytic. I won't force you to search for a speed decreasing nature, but if you get one, that would be perfect. In order to evolve, it must defeat fifteen Pokémon that are much faster then it, and tank ten super-effective hits. Unfortunately, since it can't evolve into Magnezone in Johto/Kanto, that's no big deal. Once it learns Gyro Ball, its' PP must get boosted up to max in order to get the most use out of it, and if anything is faster then Analytic, you must hammer the enemy with Gyro Ball the first turn that it is out. You must keep Gyro Ball forever after receiving it. If you have any questions, please VM me your questions. :3 Have fun.
And I'm finally typing up the challange for you, Jinzha. O_O Editing now.
Jinzha, take Paranoid the Seel. Now, the baby Seel's egg was transported from Kanto to Sinnoh via air, the egg secured in a safe crate. But unfortunately, the plane hit some turbulence, and the egg was thrashed all about in the crate. When you receive the egg and hatch it, you notice something very peculiar about this Seel due to the damage it received in its' egg. First off, Paranoid is afraid of its' teammates, due to it believing that they're government spies, so s/he can't participate in a double battle unless s/he absolutely has to, and s/he will attack her partners unless made to battle. Second off, Paranoid is very untrusting of any spray medicines or EV boosters, as s/he believes that they're poison, so you can't use them on him/her. Berries and vending machine drinks are fine, as is MooMoo Milk. And lastly, s/he believes that Byron was the one who 'damaged' the plane to injure him/her, so s/he must solo Byron to right those wrongs. However, s/he realizes that s/he is very cute, so s/he must learn Attract ASAP to use on his/her opponents. There are no evolution restrictions, obviously, so have fun. :D VM me with any questions, and you can pick between mine and Reptile's. :3