Kecleon, Wonder Guard is meh.

Linoone or Furret?

Shedinja is easy, if you have sandstorm it's gone.

Linoone - faster and I quite like the way it looks

Shelgon or Macargo?

Shelgon, for obviuos reasons.
Growlithe or hypno

Growlithe - so cute and evolves into the best ever!!!

Mantine or Grumpig?

Mantine. I like water pokemon
Poliwhirl or hitmonlee

Hitmonlee - my fav of the hitmons and quite decent - Poliwhirls alright...but at least when it isn't evolved doesn't compare

Skiploom or Pidgeotto?

Pidgeotto.
Skiploom is just one of those stupid, useless pokemon that nobody knows why the exist
Fearow or Kadabra

Kadabra - probably my favourite psychic type (over Alakazam) and it's deadly even for only a second evo - Fearow's alrite but nothing special

Cubone or Phanphy?

Cubone.
I've always adored marowak, plus cubones a little cuite.
Scyter or tauros

scyther, a bug with scythes for hands is better than a angry bull

torkoal or turtwig

Torkoal - very much stronger than Turtwig

Lairon or Marshtomp?

Marshtomp.
It evolves into Swampert, the best water pokemon around.
Charizard or Venasaur?

charizard, lots better than venasuar

which deoxys(form:attk,def,spd,norm)

Deoxys speed form.
It has to look the coolest.
Kingler or crawdaunt.

Kingler - original = best but Crawdaunt is kinda weird anyway - doesn't beat the great regular crab

Geodude or Oddish?