A good way is to leave it at the Day care center. Another way is to give your Pokemon rare candies. Last, you can challenge some of your strong friends and ask them to let you win.
try rare candies
Pokemon day care or put exp.share on a weak Pokemon
U dont get prinpulp in pokemon sapphire!!!
no
Level 40
level 40
level 30
Level 35.
Level 20+
Level 36.
level 7
Level 10.