Best Type is probably Ghost, and best Ghost pokémon in first 256 Pokémon is definitely Gengar.
There isn't one. The best is if you've perfected the dancing, got a perfect dress up and your Pokemon is the right type.
I think the best steel type Pokemon is probably dialga.
torterra is the best grass type Pokemon Pokemon Pokemon Pokemon Pokemon Pokemon Pokemon Pokemon Pokemon Pokemon VULTRAE:torterra or roserade
Dragonite is a very strong dragon type pokemon, it may be the best but you can't get a dratini until the 8th badge, as in that area so you can get one but very late in the game.
by far it has to be elctivire because its thunderpunch kills every pokemon in one hit
There are many Water Type Pokemon in Pokemon Platinum, however, there is only one strongest one. That Pokemon is Palkia. Palkia is one of the Main Storyline Legendaries in Pokemon Pearl, it is a Water/Dragon Type. If you are looking for the strongest Non-Legendary, your best bet is Gyarados. Any exceptions?
Electivire is one of the best electric type Pokemon. You get it by letting evolve Electabuzz by trading when holding a Electirizer.
one fire type one water type one grass type and your favorite Pokemon. It would also help to have a Pokemon that knows stun spore, yawn, hypnosis, ect.
The best legendary fire type is ho-oh. The best non-legendary fire type Pokemon is charizard.
Lorelei has Ice and Water type pokemon, the best way to defeat her pokemon is to use Electric type pokemon or pokemon that have Electric type moves. Bruno has Fighting type pokemon and two Rock/Ground types, the best way to defeat his pokemon is to use Psychic pokemon or pokemon that have Psychic type moves. Agatha has Ghost and Poison type pokemon, the best way to defeat her pokemon is to also use Psychic type pokemon or pokemon with Psychic type attacks.
Fighting type Pokemon
a swampert, lombre, or sceptile. if you don't have one then use a water or grass type