Infernape
Venusaur
Blastoise
Palkia
and 2 others
Rival
if you choose the grass starter then your rival will have an infernape or when you go to the Pokemon league , the 3rd elite four is a fire type user . he will have an infernape.
the best Pokemon for the Pokemon league is definetly latios
In Pokemon League
beat the league and he will be gone
infernape or lucario because both of them are powerful or you could do with who ever's level is bigger.
there are none that i know of in diamond. sorry(-_-)
I beat the league on Pokemon Diamond version, and there was no cave involved, if that's what you were asking.
beat the Pokemon league
near the Pokemon league
There is a road behind the Pokemon league where Shaymin can be found if you get Oak's letter.
She stays in the Pokemon League.