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
Pokémon Heart Gold & Soul Silver - PokéWalker
I trained an Eevee to level 100 using only the Pokéwalker while running a Marathon : r/pokemon
Pokewalker Nintendo DS Pokemon walker Heart Gold Soul Silver Japan | eBay
Pokewalker for Nintendo DS Pokemon Heart Gold / Soul Silver pocket monster Japan | eBay
Pokéwalker - Bulbapedia, the community-driven Pokémon encyclopedia
Reverse Engineering A PokeWalker | Hackaday
Nintendo Pokewalker - (NDS) Nintendo DS [Pre-owned] | J&L Game