I'm not one 100% percent sure but I know that Judgement is his strongest move.
Arceus's best moves are judgement, perish song, hyper beam, and recover
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the best way to get arceas in Pokemon diamond might be hard for you but i bet you'll think it was worth it! i have all the Pokemon on earth and arceas might have been the second hardest to get you have to get 3 dialga's and 3palkia's then put all of them in your party then they'll morph together then somehow they turn into one arceas!! i was as surprised you are!!! it may sound impossible but i speak the truth!!!!You can also you action replay which is a lot easier FROM FPM
No, electric moves have no effect on ground
i think the best moves are take down and you shouldd add moves with TMs!
It doesn't. Pikachu learns all the moves when you evolve it it will stop learning moves.