Tyranitar's best moves are Hyper Beam, Giga Impact, Stone Edge, Earthquake, Crunch, Dark Pulse, Thrash, Ice Beam, Blizzard, Thunderbolt, Thunder, Flamethrower, Fire Blast, Focus Blast, Surf, Strength, Dragon Claw and Dig.
I would have to say arceus is by far the best but i prefer tyranitars and dialga i really depends because if you battling there all AWESOME but arceus is the best but the other two are alot better at contests.
use a good fighting type Pokemon like machoke and use its moves
Fighting and Ground type moves are most effective against dialga, since it is a dragon+steel type pokemon.
shards can be used to trade with other people. in return, they may teach your Pokemon moves. there are 3 move tutors in Pokemon platinum that will teach your Pokemon moves in exchange for shards in a specific color.
Ligtning type moves, and grass type moves are super effective against water.
Island 6, in the grassy area around the sapphire cave.
I would have to say arceus is by far the best but i prefer tyranitars and dialga i really depends because if you battling there all AWESOME but arceus is the best but the other two are alot better at contests.
mr.g
Fighting (x4), Grass, Water.
any grass or dragon moves will be good (the higher the level of pokemon the more damage the moves will do to the target)
The best Pokemon is a Pokemon that has been EV trained, has the correct nature and the moves that are a mixture of Offensive/Defensive/Special. So there is no best Pokemon.
Fighting type moves are best
Psycic moves work best.
Any Pokemon with ice or electric moves
there is no good Pokemon and bad Pokemon its just the way You level it up and what moves it knows /execpt Magikarp they cant learn moves but Gyrados is worth it at the end.
bastodien evolition of shildon
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.