Can a Pokémon ‘join’ from nowhere in the Pokéwalker

pokemon-heart-gold-soul-silverpokemon-hgss-pokewalker

I'm currently playing Pokémon HG/SS with a Pokéwalker. One day I was transferring my Pokémon from the Pokéwalker back into the game and maybe like a couple of minutes later a Pokémon appeared. In this case, it was a Geodude, and it joined like I'd captured it, which I hadn't, and it's still here, on my Pokéwalker, is this normal?

Edit: I didn't have any Pokémon, item or anything else on the Pokéwalker when this one appeared.

Best Answer

Yes, if you go walking with a Pokewalker that has no Pokémon there is a chance that a Pokémon will join you and follow you around. You will be able to import this Pokémon into your game.

From Bulbapedia:

The Pokéwalker can be used without a Pokémon stored in it, as well. It will continue to accumulate steps and watts. The Dowsing Machine can still be used, but the Poké Radar cannot, as no battle could take place. In addition, Pokémon from the route being walked may voluntarily join in the Pokéwalker seemingly at random, taking the spot of the missing Pokémon, essentially being caught for free.