There is no trainer with a Drifloon that i know of, but you can easily change the date on your Nintendo DS to Friday, if it's not already Friday (If it isn't Friday, change it, as said before, and wait at least an hour or so for it to change the day on your game), and go to Floaroma town. From Floaroma town head east and you will find Valley Windworks. As your walking up to the path, near the door there will be a Pokemon (not in the grass) press the "A" button when in front of it and use any pokeball to catch it. It's fairly easy to catch. After that save and change the date back. You now have the Pokemon Drifloon.
***EDIT***
Actually, there is a trainer with Drifloon.
In the Hearthome Gym, there is a trainer with the Pokemon Drifloon in its party. I cannot remember exactly which trainer it was, but there was definitely a trainer with the Pokemon Drifloon in the Hearthome Gym.
EDIT
Really? UGHHH
you actually only have to wait abut six seconds
LOLAHULA:
All you need to do is save in the field of Floroma town, than turn your game (BE SURE YOU SAVE) change the date on your Nintendo DS to
Friday, look at the calender to see what the nearest Friday is than confirm than you can turn your game back on and go to valley wind works and the Drifloon will be by a sign
one of the elite 4 has one
Pokemon 65 in Diamond is Drifloon.
There actually isnt a trainer in pokemon pearl that has drifloon, but you can catch them every friday in front of the valley windworks, just go up to the drifloon and press a. he is at level15
Number 65 Pokemon in D/P is Drifloon. Most people ask this because no trainer has Drifloon. You can find one standing outside of Valley Windworks every Friday.
When you battle the 5th gym leader there is a trainer on the 2nd and 3rd floor who has drifloon. Also if you go to floaroma town and go o valley windworks, the will be a small sign next to a patch of grass, drifloon will sometimes be hovering there. I know this because i have 10 drifloon's and i have also battled the trainer who has one.
one of the elite 4 has one
Pokemon 65 in Diamond is Drifloon.
There actually isnt a trainer in pokemon pearl that has drifloon, but you can catch them every friday in front of the valley windworks, just go up to the drifloon and press a. he is at level15
drifloon
u battle team galactic in the wind works and one of them has a drifloon
Number 65 Pokemon in D/P is Drifloon. Most people ask this because no trainer has Drifloon. You can find one standing outside of Valley Windworks every Friday.
Battle a Trainer.
When you battle the 5th gym leader there is a trainer on the 2nd and 3rd floor who has drifloon. Also if you go to floaroma town and go o valley windworks, the will be a small sign next to a patch of grass, drifloon will sometimes be hovering there. I know this because i have 10 drifloon's and i have also battled the trainer who has one.
drifloon
at level 28
I think you are referring to a drifloon or a drifblim. Drifloon is a ghost/flyig Pokemon and so is it's evolution drifblim. I might be mistaken, you might also be reffering to jigglypuff, written as the "balloon" Pokemon but considerng you said Diamond, I think you mean the Drifloon.
You need to battle every trainer in the game. * Unown is not owned by any trainer. It can be found at the cave east of Soleacon Town. * You may not have battled the trainer with Drifloon in Hearthome Gym. If not, see (and possibly catch) one every Friday at the Valley Windworks.