Because you probrably haven't either, talked to her between 15:00pm -14:00pm (3:00pm - 4:00pm), haven't defeated the Elite Four and the Champion or you've glitched up your game so much it dosen't work properly.
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show her a Pokemon with full hapiness (lol) and have her massage it 5 times.(lol+) (:
In Pokemon soul silver, haircuts serve the same purpose. In the Goldenrod Underground (the entrance is next to the colorful tent), you can find one of the brothers at a booth on various days. Daisy Oak will also massage your pokemon.
Come to Blue's house between 3 and 4 pm. She will offer to massage your Pokemon during that time. If you come 5 days in a row, she will give you Blue's phone number.
If you have Blue's number, you can call him or whatever when one of your Pokemon are at maximum happiness.Blue's sister Daisy in Pallet Town gives your pokemon a massage. I don't what time of day, but i have heard 3pm-4pm on Mondays. After she gives 5 massages to your pokemon, she will give you Blue's phone number so you can call him for a rematch. Hope this helps!
you speak to her between the hours 15:00 and 16:00 (3:00 pm and 4:00 pm) She asks you for tea