Vaporeon for sure.
>played the shit out of Gold as a kid
>evolved the Eevee you get from Bill into a Vaporeon
>nickname him Tunaman
>bro for life, Surfan' , Shadow Ballan' and Ice Beaman' everything in my way.
>play Ruby years later
>use an AR to get an Eevee pre-FRLG
>Tunaman returns
>play HeartGold much later, repeat Tunaman's glory day from Gold
>jump to Y version, dicking around in a Friend Safari looking for a female HA Eevee
>this nigger pops up 6 encounters in
>now have a purple Tunaman
>he'll soon be sent to Hoenn