Walkthrough
At the end of Route 2, you and Hop will meet Professor Magnolia. Leon will also be there, and Magnolia will actually suggest Leon gives you a Letter of Endorsement so you and Hop can officially enter the Gym Challenge. Before doing so, Leon will want to see the two of you battle once more to assess if both of you are ready to do so. Since your last battle, Hop will have added an additional Pokemon.
Pokemon Trainer Hop (Grookey Starter): Level 6 Wooloo, Level 5 Rookidee, Level 8 Sobble
Pokemon Trainer Hop (Scorbunny Starter): Level 6 Wooloo, Level 5 Rookidee, Level 8 Grookey
Pokemon Trainer Hop (Sobble Starter): Level 6 Wooloo, Level 5 Rookidee, Level 8 Scorbunny