None of the Four gave me too much trouble. Feraligatr and Crobat handled Will with their Bite attacks, Graveler and Typhlosion were no match for Koga's Poison and Bug types, and Crobat and Meganium KO'd Bruno's Fighting and Rock types. Karen was a little more difficult since I didn't have anything super effective against Dark types, but I paid attention to her dual types and made it past her.
Lance didn't pose much of a threat to Feraligatr. After I defeated the Dragon Master, My team and I were registered in the hall of fame and I was officially made Champion.
After the credits rolled and I received the S.S. Ticket from Professor Elm, I flew straight to Goldenrod to receive my GS Ball. I brought it to Kurt to examine. He needed time, so I spent it doing some soft resetting for a shiny Suicune at Tin Tower. I beat the Wise Trio and they let me enter the Tower. I saved right outside and encountered 100 Suicune before I put this hunt on hold and went to bed.
The next morning, I returned to Kurt for the GS Ball and saved my game in front of the forest shrine. I am now soft resetting for Celebi.