After you defeat Clair and Lance at the dragons den with your rival,look at your pokegear.If it is anywhere between 6:00-10:00,then go back to the dragons den and you'll see Clair.Talk to her and she will give you her phone number.Then,you can call her back Friday night to arrange a rematch in the Saffron City dojo.
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after you and your rival have beaten her and lance in a tag battle, she will be in dragon's den between 6 and 10 am
In Pokémon HeartGold and SoulSilver, you get Jasmine's Phone Number by going into the café in Olivine City any day between 1 PM and 2 PM. Talk to her there and she'll add her number to your Pokégear.You can get her number by going to Olivine City diner any day between 13:00-14:00
Watts are associated with the exclusive Pokewalker. Every twenty steps you take make one Watt, and once you get a certain number of Watts you can unlock new places. The Pokewalker is exclusive to HeartGold and SoulSilver.
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!
Meganium or nine tales