Pokémon Ranger: Hikari No Kiseki: Stuck?/Help Topic

Hey guys. Here you can ask for help for the new Pokémon Ranger game.
Patched Rom (Thanks to 'mikeac')First of all, I'm going first. I just 'captured' (you don't get to keep it) Celebi at the beginning. Now I'm with this kid but I don't know what to do.~Kiekoes

I think you walk around and go inside houses and islands. I forgot what to do... but I just caught Entei