>>37123600>Espeon>JolteonReally good. You have to waste a TM on Jolteon end game and both are outclassed by Gardevoir (minus being way faster) but they are generally the best and are a speed runners best friend.
>VaporeonDecent. High HP is nice and Aurora Beam is great when you learn it but there's no Surf in GoD so your stuck with water gun/pulse as your stab.
>UmbreonOkay but the lack of offensive presence is trouble some. You do start with a STAB move but Houndour and/or Carnavanh are much better with Bite spam.
>FlareonBad. Houndour is available at the start and is better. Vulpix is available half way through the game and is better
(and Vulpix is awful in this game.) Use that flame thrower TM on something else.