fire, bug, and poison types of course!
Her name is Iris (or atleast in japan) and she is the dragon gymleader in Pokemon white
Any Pokemon strong to water: Electric types and grass types work the best.
Are you serious? Washroom!
1st- Giratina. 2nd- Dialga. But that's only a matter of opinion.
If at all possible try to get a fighting-type Pokemon. Any fighting type move will be super-effective against a normal-type Pokemon, which is basically all of the third gym. The gym can be defeated by your starter Pokemon if you are on a high enough level, but it is best to have a second Pokemon by now.
Diamond is not a Pokemon but i think Arceus is one of the strongest Pokemon ever.
the best Pokemon on diamond would be arceus but you can only get that from action replay, other than that i think the best Pokemon would be giritina..
the best Pokemon for the Pokemon league is definetly latios
Palkia
the best Pokemon in diamond is arceus, but you have to use action replay or wi-fi mystery gift
No Arceus is the best Pokemon in Pokémon Diamond.
The best Pokemon on Pokemon diamond is obviously a Bidoof...Joke :)No this is entirley an opinion based question but the best aka most powerful,and most defensive is Diagla