all you need is a ground type, but for octillery, maybe use an electric Pokemon or grass one, or it will slaughter your ground one otherwise
no
no only leaf and fire
by going beating all seven gyms then go to a island with a volcano:)
the gyms are in the citys but some are harder to get into than others
On diamond, pearl and platinum I think you just have to beat all the gyms and travel north of the last city through a big cave if that doesn't work then try getting the national-dex but you probably don't have to.
no
keep beating gyms
beat 8 gyms
no only leaf and fire
Beat one of the gyms I forgot which one
There is no way you have to compleate the pokedex but most of it is at the gyms.
No because who would you face it is a tridition to have 8 gyms
by going beating all seven gyms then go to a island with a volcano:)
you have to beat all the gyms before the harthom one
well..... its almost the same as diamond & pearl. the towns are the same but the gyms are wayyyyyy cooler. also u get to ride in a piplup boat and walk on waterfalls.
no.
you beat all of the gyms that you havnt beaten yet, coincidence that im currently playing diamond!!!