How can you train pokemon fast on diamond?

Question

how can you train pokemon fast my team are:

torterra level 85

floatzel level 32

graveler level 26

staraptor level 39

lucario level 28

salamence level 67

mainly want to train all the low levels mostly lucario

thx!!

Answer 1

give Lucario exp.share and keep battling the elite four, once Lucario can beat some pokemon in the elite four, it won't need exp.share anymore.

Answer 2

you could give lucario the exp. share and fight at stark mountain with torterra.

Where'd you get the salamence?

Answer 3

Give them lucky eggs and train. They will get double the exp.