The best Pokemon to have in Pokemon diamond is Arceus because he has the best stats in Pokemon diamond.
Answer 2
Marowak and Latios are better.
Answer 3
Dragonite would have to be the best!
It has great stats, is immune to a lot of types and can learn many moves like fire-type moves to deal with super effective ice-types.
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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
Chimchar
swampert miltic
The best fishing spot on Pokemon diamond is the 3 lakes where u can also find mesprit uxie and azelf