you just train your newly obtained starters and battle the elite 4 and Red again
first u battle and defeat Red on MT SILVER then you go yo SAFFRON CITY in kanto while there go to silphco go to the counter in top right and there you find Steven.when you talk to him he will ask you...
It is Torchic
he is in the pewter city mining museum
Speak to Steven in the Kanto's sixth gym city after you collect all 16 badges.