What is the best Pokemon for each type?

You need to be much more much more specific than that...

Fire Types(Legendary not included): Most good Pokemon in Fire type division are..Charizard,Blaziken,Tyhphlosion,Magmar,Ninetales are far more good fire types...

There's a lot more but it depends on their stat...there's no really strong Pokemon depending on type only...it's really complicated to explain..

The legendaries obviously excel in these cases. In most cases, excluding legendaries, there are several pok�mon of each type that could compete for the top spot. So, in many cases, there is no best pok�mon for each type.

Steel: metagross

Phsycic: mewtwo

Dark: tyranitar

Rock: golem

Ground: groudon

Grass: exeggutor

Fire: flareon

Electric: jolteon

Water: starmie

Fighting: machamp

Flying: skarmory

Ice: regice

Normal: slaking

Poison: weezing

Dragon: salamence

Bug: heracross

Ghost: gengar

Normal:
-Slaking: Attack stats are just ridiculously high, it's other stats aren't that bad too, just very bad ability.
-Zangoose: Can be a pretty good attacker, but that's about it.
-Wigglytuff: Can take some decent hits, not bad of a Pokemon at all!

Fire:
-Blaziken: High sp.atk and atk, a very good starters, does have a high weakness to flying though.
-Camerupt: Learn some good moves and decent attacking stats, slow speed is it's main weakness.

Water:
-Swampert: A good water type with good typing except for 4x weakness to grass.
-Gyarados: Very hard to train as magikarp, but the early Exp. Share helps a lot. Good sweeper.
-Tentacruel: High sp.def and nice typing. Pretty good for such a common Pokemon.
-Ludicolo: Good typing, let it learn ice beam through TM and this can make a very good Pokemon.

Electric:
-Manectric: Fast and agile, it is a very good electric type. With decent sp.atk, a very good team member.
-Magneton: Good special attack and resist a lot of attack, very good Pokemon.
-Lanturn: Good type but bad stats, depends if you are willing to take that.

Grass:
-Breloom: Fighting sub type is not that good, but makes a good sweeper.
-Cacturne: A decent grass type, a bit rare though.
-Vileplume: Very overused but doesn't mean it's bad, if sun light is strong this can be very good.
-Shiftry: Also can be good Pokemon if sun light is strong, very good Pokemon.

Ice:
-Walrein: not much choice here, but hey, walrein is quite good!

Fighting:
-Machamp: Relies heavily on attack power, still a fantastic fighting type though!
-Medicham: Pure power doubles it's attack, so a good sweeper.

Poison:
-Weezing: Good defensive wall, can learn moves like explosion. A very under rated Pokemon.
-Crobat: Very fast poison type, surprisingly good for such a common Pokemon.

Ground:
-Donphan: Phanpy can be found in the safari zone, if you evolve it can be a terrific ground type.
-Claydol: Very defensive, could be a good wall.

Flying:
-Altaria: Very underrated, in reality it's pretty good.
-Swellow: Fast and agile, almost always will hit first. Its other stats hinders it a bit though

Psychic:
-Gardevoir: Hard to train but becomes one of the best special attacker and special defender.
-Alakazam: Highest special attack of all non-legendary pokemon. But needs trading to get.

Bug:
-Heracross: High attack with very good moves it can learn. Sub type is not as good though.
-Pinsir: Lower stats than heracross but a bit less weakness. Depends on what you want.

Rock:
-Golem & Rhydon: good attack and defense but very bad typing with lots of weakness.
-Lileep: Quite underrated, but look at how steven stone use it, it's nothing to be underestimated.
-Armaldo: good attack and defense but the speed really slow it down.

Ghost:
Dusclops: Also very good Pokemon defensively, but also learn some good moves.
Banette: Good attacker, other stats are not particularly outstanding though.

Dragon:
Salamence: Pseudo legendary. Very good attacker. But hard to train with 4x weakness to ice.
Kindra: Quite Balanced stats, get a dragon dance up and it's a beast. Needs trading though.

Dark:
Absol: Underrated by a lot. It is bad in speed and defense. Attacks are strong though. Use TM30 on it.

Steel:
Metagross: Pseudo legendary, very strong but hard to train and can't obtain in main story line.
Aggron: 180 defense! Makes it a very strong defensive wall. Has two 4x weakness, which hinders it.

Fire: arcanine

Water:gyarados

Grass: sceptile

Flying:pidgeot

Fighting: lucario

Poison: nidoking

Normal: snorlax

Steel: metagross

Bug: scizor

Dark: absol

Ghost:gengar

Dragon: dragonite, the best

Rock: golurk

Ground: nidoking in here too

Psychic: alakazam

Ice: lapras.

Electric: idk y you say other pokemons. Clearly electivire is the best.

This is from my experience and opinion of my friends.hope this is helpful to ya.

Water-ash greninja

Note: This is my opinion, and I'm not good with stats, but thes Pokemon have worked incredibly well for me in the past.

Bug: Anorith
Dark: Crawdaunt
Dragon: Salamence
Electric: Manetric
Fighting: Hariyama
Fire: Blaziken
Flying: Skarmory
Ghost: Dusclops
Grass: Sceptile
Ground: Sandslash
Ice: Walrein
Normal: Slaking (even with his trash ability)
Poison: Crobat
Psychic: Gardevoir
Rock: Cradily
Steel: Aggron
Water: Marshtomp

According to my research on Google ,BLAZIKEN is the best fire type Pokemon ,,KYOGRE is the best water type (you can get this Pokemon by cheats which I have done as well),,LUDICOLO is the best grass type Pokemon because because of his two types:- water and grass it won't get super damage from both fire and ice but if you want a pure grass type anyway then it's sceptile ,,RAYQUAZA is the god(the most powerful Pokemon) of the game as my research shows

Thanks for reading