your not suppose to defeat him, well if you do you can't change his forme's and your going to be stuck with his altered forme which is defensive not attack if you captured him you would've have another chance to go to the distortion world which remains an item griseaus orb that can change his altered forme to his origin forme, (attack)
anyway you head for the Pokemon league which is above sunyshore city you have to fight a lot of trainers on the way so it's going to take a while after you've battled everyone you're now going to have pass victory road and there is more trainers to battle and loads of HM moves are required to go to certain places and after you've done that you'll now going to enter the Pokemon league but you have to battle your rival then enter the elite four, do you have what it takes to beat the elite four and the champion?
Hearthome's badge
Get the first gym badge
You can use the GTS in Pokemon Platinum after you get the first gym badge from the Oreburgh City gym.
You need to defeat Koga in Fuchsia City to get the 5th badge, the Soul Badge.
Once you obtain a badge it's permanently stored in the badge case.
you have to first get the badge from pastoria and defeat the bad guys at each of the lakes then the man saying that the electricitys
Hearthome's badge
in the 1st gym badge
you get the coal badge after defeating Roark in eterna city
You have to defeat a gym leader
if you are looking for the third gym badge i suggest Veilstone city.
If on Pokemon diamond or pearl you defeat wake the water type at pastoria city.Use grass type!If on platinum you defeat maylene the fight type at veilstone city!Use fly type!
Get the first gym badge
You can use the GTS in Pokemon Platinum after you get the first gym badge from the Oreburgh City gym.
The fifth gym leader in Pokemon platinum is crasher wake but you get the fourth badge.
Defeat the gymleader.
You need to defeat Koga in Fuchsia City to get the 5th badge, the Soul Badge.