Wobbuffet: Go up to Wobbuffet and talk to it and try to use the Decoding Machine on it...unfortunately it does not work. You need to go back to Prof. Kaminko's house to find out how to heal it, but first another Pokémon in the Village has been muted...
Pokémon 1: That Pokémon is a Lotad in the far right of the village. Talk to it and the decoding machine will eventually be able to restore Lotad's Voice, however this time there are no quizzes
Pokémon 2: Go back to Kaminko's Lab and he will tell you that the only other way for a Pokémon to get it's Voice back is for a trainer who shares a close bond with it to mimic it's cry. So go back to Bilbo's house and tell him this, he will attempt to mimic Wobbuffet's cry and will finally get it curing Wobbuffet of it's ailment!
The Lucky Egg!: With all the Pokémon in Orre able to speak again, go back to Eagun's Wife. She will congratulate you and give you the rare and elusive Lucky Egg. Congratulations, you have completed Pokémon XD now.