after hours of playing on my pokewalker I finally got it : r/pokemon
Winner's Path (Pokéwalker) - Bulbapedia, the community-driven Pokémon encyclopedia
PokéWalker hacking - Dmitry.GR
Heart Gold with the PokeWalker. Just got Dratini to 53 before the first badge using only the Walker for getting EXP. Now I need to level it up in Game to evolve