Yes there are trainers that will have a Combee and a Lumineon, an Aroma Lady in Route 208 has Combee and a Swimmer in Route 223 has Lumineon.
The trainer is west of Hearthome City. The trainer is an Aroma Lady (I think) with Combee and Roselia.
In the city!
No. 53 is combee found by smearing honey on trees
you can find in a spesial tree.
put honey in a tree and it will come
No trainer has a combee in diamond and pearl but you can find a combee on trees you put honey on. There is a trainer in route 208, she has combee and Roselia
Near Hearthome City The Lady (Near The Berry Master) 15 catch Combee with sweet honey
You have to put honey on a honey tree, and combee is a Pokemon that is more likely to appear in the tree, unlike munchlax. There is a girl trainer on route 208, i think.
The trainer is west of Hearthome City. The trainer is an Aroma Lady (I think) with Combee and Roselia.
about 7 people
In the city!
I doubt it as combee appeared first in Diamond and Pearl
put honey on a tree
If you go to harthome city and tun vest there vill be a trainer with combee. If you go into the cave you have gon to far.
the girl in the place beside hearthome city
evolve a girl combee at lv20
After the elite four, you will have seen most of the Pokemon if you battle every trainer you see. Here are some Pokemon hard to find in sinnoh... Riolu:Hatch egg from Riley or go to the Oreburgh gate, after you get the bicycle from Eterna City, and go up. you will need surf and strength to do this so at least after the canalave gym you should use this plan. Anyway, go on the lake and battle the vetaran on the other side, to the west. He will have a Riolu. Lumineon: On the route to the victory road, one of the girls will have a lumineon. Combee: On the route to the west of Hearthome City, there will be an aroma lady who is the only trainer who will have a combee. Dialga(Pearl)/Palkia(Diamond): Talk to Cynthias grandma after beating the champion in the big house to the north.She will show you the opposite of your game cover. That's it from me!!! If you have more Pokemon answer and that will help!