u cant. does somebody have a crush on blue? .......... just kidding. but seriously, u cant, sorry.
EDIT:
Haha, yes you can. You get a party full of Pokemon with max happiness, and talk to Daisy in Blue's house (Pallet town) on a Monday. Have fun!
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it has to be on a specific day. go to blues house (the one on the right in pallet town) and talk to his mom. she will give you a letter and you have got to write sompething on it. do this 7 times and she will give his number. its sompething like that. i think it was saturday, but im not sure
Blue, is a Gym Leader who doesn't leave the gym for you to obtain their phone number. Instead, to get his phone number, you have to show a Pokémon of full happiness to his sister, Daisy Oak in Pallet Town after she has massaged your Pokémon 5 times. Once she sees it, she will give you his number. Then, on Sunday Night, you can call him to arrange a rematch
he will be anwhere see him and you get his phone number when you talk to him
you have to battle him and if it doesn't work you are never going to get his phone numberAfter battling Chuck and winning, talk to his wife. She will give you his phone number.
Get her phone number registered in pokemon then ring her if you would want to battle her again
You have to battle lance many times; then he should give you his phone number. I think it's five times IN A ROW.
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