New challenge for any 5th gen game:
Start in Nimbassa City, with any one pokemon of your choice caught from the adjacent routes, without any level grinding (or hatched from an egg and at level 1). Walk around the big loop in Unova (Nimbasa, Driftveil, Mistralton, Icirrus, Opelucid, Lacunosa, Undella, and Black City/White Forest; either all in that order, or all in reverse order). You may not stop to heal your pokemon, except for medicine that you bought using money earned during this challenge (no finding it on the ground). You may not use Fly during the challenge, and you may not have any HM slaves (you must use pokemon in your party for any HM you want). You may only catch pokemon with pokeballs that you bought during the challenge with money you earned during the challenge. TMs and HMs are fine to use, but no using the move tutors unless you found the shards that you will use during your challenge.
You also may not use anything that would break the spirit of the challenge, such as rare candies and repels.
OPTIONAL ADDITIONS: Visit other cities on your loop (for example, Lentimas Town) in addition to the ones in the loop itself.
Play on an emulator and do not remove the no experience code that emulators have, for added difficulty.
Start in Nimbassa City, with any one pokemon of your choice caught from the adjacent routes, without any level grinding (or hatched from an egg and at level 1). Walk around the big loop in Unova (Nimbasa, Driftveil, Mistralton, Icirrus, Opelucid, Lacunosa, Undella, and Black City/White Forest; either all in that order, or all in reverse order). You may not stop to heal your pokemon, except for medicine that you bought using money earned during this challenge (no finding it on the ground). You may not use Fly during the challenge, and you may not have any HM slaves (you must use pokemon in your party for any HM you want). You may only catch pokemon with pokeballs that you bought during the challenge with money you earned during the challenge. TMs and HMs are fine to use, but no using the move tutors unless you found the shards that you will use during your challenge.
You also may not use anything that would break the spirit of the challenge, such as rare candies and repels.
OPTIONAL ADDITIONS: Visit other cities on your loop (for example, Lentimas Town) in addition to the ones in the loop itself.
Play on an emulator and do not remove the no experience code that emulators have, for added difficulty.