Hello Eobard and I am sorry that this happened to you, but lets try some steps in order to solve this. Firstly talk to the computer in the Professor Oak Lab in order to update the legendary dex entries. After it try to talk to the man in Celadon Office to see if you can get the ticket again. If this happens, try to check if the Lapras is on Pallet Town between 12h and 13h and restart the quest.
If unfortunatly you weren't able to, do not worry and we will reply here with further instructions to solve this :)
-Hi again, I did what you told me to do step by step.. and still nothing.. :S :Frown: :Frown: