Chow's Flareon and Jim's Tauros is accepted.
ignoring that I've never bothered to catch a fucking Chansey in the Safari Zone, let alone a TAUROS
1. TM13, take a Bulbasaur named Powder. It must know & keep Sleep Powder & Poison Powder. Evolve after inflicting both Powders of 5 Different Trained Pokemon, & repeat this on a further 15 to evolve again.
2. TM13, take a Sandslash named AJ. When it's a Sandshrew, it thinks that it's AJ's one from the anime, and is super tough. Hence it can take water attacks with no worries, meaning that it needs to battle every water pokemon you fight until he evolves. Also, to evolve, he needs a 100 victories, with at least 50 of them being water pokemon you encounter. As a Sandslash, the only Ground type move he can use is Fissure, since he's a boss like that.
Oh, and he needs to solo Agatha. Enjoy.
3. Ice Beam, take a Rattata named Master. To evolve, solo the rival once after you get badge two. It cannot know hms. Must solo one E4 member out of the last 4 and one E4 member. For bonus points have it land the finishing blow on the champ's main Pokemon.
4. @TM13IceBeam: I'd like to give you a Nidoran(male). Call him Stabby, because you're gonna be using a lot of his weapon-like moves! It can only evolve after soloing eight Pokemon with STAB (which is only Poison Sting in Yellow, I believe), two of which being GLMP, and then evolve again after defeating four Pokemon with Horn Drill. After completing these, he has no restrictions!
...Except the need to OHKO three Pokemon from a selection of the last two Gym Leaders, or Pokemon from the Elite Four. Only one Pokemon from each member (IE, if you OHKO one of Blaine's, then you can't OHKO two more to complete the challenge), and it doesn't have to be Horn Drill; it can be any move, as long as it takes someone out in one hit.
5. Well aren't you lucky! You get King the Tauros, the best Pokemon of the old Gen I metagame! Enjoy your future MVP! Oh wait, hang on a second, this just in.
Apparently King thinks that it has the ability Sheer Force from Generation Five, despite the fact that it's in Generation ONE and Abilities aren't even a thing yet. He also got his Special and Attack stat mixed up. As such, the only moves you are allowed to use on King are Special moves that would be boosted by Sheer Force in 5th generation.
Well it's still a Tauros right? Enjoy!
One Final Word: Don't worry IceBeam, this challange isn't as sadistic as it looks. In Gen I Tauros actually has an acceptable Special Stat of 70 and Tauros has a surprisingly decent Special move pool. It might not be your MVP but it shouldn't suck total balls either.
EDIT: @TM13IceBeam, I just realized that EVERY Special attack Tauros learns in Gen I would be boosted by Sheer Force, making that restriction useless. So to rectify that I'll add in this little bit: If the secondary effect of one of King's attacks activates, it becomes confused as to how that is possible and must be swapped out immediately, to prevent it from hitting itself. Gottit?
6. OK, now I need to ask Chow to re-do his challange AGAIN, because gender doesn't exist in G1. >.>