I just found my old Pokewalker in my room after I lost it about 4 years ago. It ran out of batteries, and I just remembered that my Blaziken's in there :O!!! If I change the batteries, will it disappear? I don't have the right batteries for it now, so I can't test it and see. Please help, it's been 3 days since I asked and I really need the answer!
EDIT: I already restarted the HeartGold game that came with the Pokewalker, btw