Take a Electrike. You must catch the first Electrike you see (if you KO it, just find another one. You may not SR for natures or anything like that though). Your challenge is based on the first Wild Pokemon you see on Route 110 after catching the Electrike; no Fishing/Surfing.
If it is another Electrike, you get the King of Route 110 challenge. Electrike must never learn a move with base power above 70, but you can raise that limit to 100 if you get rid of one of your moveslots permanently. It must solo the Route 110 Brendan/May battle to show its dominance over Route 110. If you solo May on Route 110 on your first try, then the only other restriction is that it must solo three of Winona's Pokemon. If you do not solo May on your first try, Electrike must solo Wally in Victory Road. Don't fuck this up :).
If it is a Zigzagoon, you get a Lolcat Few Good Moves challenge. Manectric must not learn Thunderbolt, Flametrower, Overheat, Hidden Power, or Crunch. This one's pretty easy, hope you get a 'goon!
If it is a Plusle, you get the Consecutive Gym Leader Solo challenge Electrike must start soloing Gym Leaders immediately. It must be used against Wattson's first Pokemon and must keep soloing his Pokemon until it dies. You may not SR at all. If it successfully soloes Wattson, repeat the process at Flannery until it eventually dies in a Gym Battle. You may only use Potions equal to the number that the Gym Leader has. Your restrictions vary with how many Pokemon you soloed before dying for the first time.
If you soloed 0 consecutive Pokemon, then Manectric must solo Steven without items.
If you soloed at least one consecutive Pokemon, then Manectric must solo five Pokemon belonging to Elite Four members, only one can be Glacia's
If you soloed at lease three consecutive pokemon, then Manectric must solo Wallace, except for the Whiscash.
If you soloed at least six consecutive pokemon, then Manectric must solo three more Gym Leader pokemon.
If you soloed ten or more consecutive pokemon (yeah, right), then you must solo 2 E4 pokemon
If it is a Oddish, you get a Eightfold Path challenge then you must solo 8 Pokemon belonging to Gym Leaders, E4 members, of the Champion on your first try. If you have not soloed at least 2 by Drake, you may SR to complete the challenge.
If it is a Gulpin, you get a Gulpin RAAAAGE challenge. It must always have four attacking moves, the sum of the Base Powers of the moves may not exceed 200, and it must solo every Poison type you come across. Wild or otherwise. For every Poison type you fail to solo, the 200 limit drops by 10. You may not SR if you fuck up.
If it is a Wingull, you get a Level Boundary challenge. It must never be the highest, second highest, OR lowest level Pokemon on your team. Have it solo a Gym Leader for the lulz.
If it is a Minun, then congratulations! There are NO RESTRICTIONS on this Pokemon. There is a 2% chance of this happening ;)