Aaron - Bug Types:
Lv. 53 Dustox
Lv. 53 Beautifly
Lv. 54 Heracross
Lv. 54 Vespiqueen
Lv. 57 Drapion
Bertha - Ground Types:
Lv. 55 Quagsire
Lv. 56 Sudowoodo
Lv. 55 Whiscash
Lv. 56 Golem
Lv. 59 Hippowdon
Flint - Fire Types:
Lv. 58 Rapidash
Lv. 58 Drifblim
Lv. 57 Steelix
Lv. 57 Lopunny
Lv. 61 Infernape
Lucian - Psychic Types:
Lv. 59 Mr. Mime
Lv. 59 Girafarig
Lv. 60 Medicham
Lv. 60 Alakazam
Lv. 63 Bronzong
Cynthia - Champion:
Lv. 61 Spiritomb
Lv. 60 Gastrodon
Lv. 60 Roserade
Lv. 63 Lucario
Lv. 63 Milotic
Lv. 66 Garchomp
the best Pokemon for the Pokemon league is definetly latios
beat the league and he will be gone
In Pokemon League
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.
near the Pokemon league
beat 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.
No
You can get it in the underground after the national dex which you get after the Pokemon league
beat the Pokemon league